diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index fb1f62ddaf5..b138ce9ea70 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -24153,6 +24153,16 @@ namespace ts {
             }
         }
 
+        /**
+         * The name cannot be used as 'Object' of user defined types with special target.
+         */
+        function checkClassNameCollisionWithObject(name: Identifier): void {
+            if (languageVersion === ScriptTarget.ES5 && name.escapedText === "Object"
+                && moduleKind !== ModuleKind.ES2015 && moduleKind !== ModuleKind.ESNext) {
+                error(name, Diagnostics.Class_name_cannot_be_Object_when_targeting_ES5_with_module_0, ModuleKind[moduleKind]); // https://github.com/Microsoft/TypeScript/issues/17494
+            }
+        }
+
         /**
          * Check each type parameter and check that type parameters have no duplicate type parameter declarations
          */
@@ -24279,8 +24289,10 @@ namespace ts {
                 checkTypeNameIsReserved(node.name, Diagnostics.Class_name_cannot_be_0);
                 checkCollisionWithRequireExportsInGeneratedCode(node, node.name);
                 checkCollisionWithGlobalPromiseInGeneratedCode(node, node.name);
+                checkClassNameCollisionWithObject(node.name);
             }
             checkTypeParameters(getEffectiveTypeParameterDeclarations(node));
+            checkTypeParameters(node.typeParameters);
             checkExportsOnMergedDeclarations(node);
             const symbol = getSymbolOfNode(node);
             const type = <InterfaceType>getDeclaredTypeOfSymbol(symbol);
diff --git a/src/compiler/diagnosticMessages.json b/src/compiler/diagnosticMessages.json
index be96d3de07d..f0bb5e5ed7d 100644
--- a/src/compiler/diagnosticMessages.json
+++ b/src/compiler/diagnosticMessages.json
@@ -2357,6 +2357,11 @@
         "category": "Error",
         "code": 2724
     },
+    "Class name cannot be 'Object' when targeting ES5 with module {0}.": {
+        "category": "Error",
+        "code": 2725
+    },
+
     "Import declaration '{0}' is using private name '{1}'.": {
         "category": "Error",
         "code": 4000
diff --git a/tests/baselines/reference/es6modulekindExportClassNameWithObject.js b/tests/baselines/reference/es6modulekindExportClassNameWithObject.js
new file mode 100644
index 00000000000..d5af2ffafa0
--- /dev/null
+++ b/tests/baselines/reference/es6modulekindExportClassNameWithObject.js
@@ -0,0 +1,11 @@
+//// [es6modulekindExportClassNameWithObject.ts]
+export class Object {}
+
+
+//// [es6modulekindExportClassNameWithObject.js]
+var Object = /** @class */ (function () {
+    function Object() {
+    }
+    return Object;
+}());
+export { Object };
diff --git a/tests/baselines/reference/es6modulekindExportClassNameWithObject.symbols b/tests/baselines/reference/es6modulekindExportClassNameWithObject.symbols
new file mode 100644
index 00000000000..b05183ae935
--- /dev/null
+++ b/tests/baselines/reference/es6modulekindExportClassNameWithObject.symbols
@@ -0,0 +1,4 @@
+=== tests/cases/conformance/externalModules/es6/es6modulekindExportClassNameWithObject.ts ===
+export class Object {}
+>Object : Symbol(Object, Decl(es6modulekindExportClassNameWithObject.ts, 0, 0))
+
diff --git a/tests/baselines/reference/es6modulekindExportClassNameWithObject.types b/tests/baselines/reference/es6modulekindExportClassNameWithObject.types
new file mode 100644
index 00000000000..b0b9cd7f6a6
--- /dev/null
+++ b/tests/baselines/reference/es6modulekindExportClassNameWithObject.types
@@ -0,0 +1,4 @@
+=== tests/cases/conformance/externalModules/es6/es6modulekindExportClassNameWithObject.ts ===
+export class Object {}
+>Object : Object
+
diff --git a/tests/baselines/reference/exnextmodulekindExportClassNameWithObject.js b/tests/baselines/reference/exnextmodulekindExportClassNameWithObject.js
new file mode 100644
index 00000000000..e56b6ad8f16
--- /dev/null
+++ b/tests/baselines/reference/exnextmodulekindExportClassNameWithObject.js
@@ -0,0 +1,11 @@
+//// [exnextmodulekindExportClassNameWithObject.ts]
+export class Object {}
+
+
+//// [exnextmodulekindExportClassNameWithObject.js]
+var Object = /** @class */ (function () {
+    function Object() {
+    }
+    return Object;
+}());
+export { Object };
diff --git a/tests/baselines/reference/exnextmodulekindExportClassNameWithObject.symbols b/tests/baselines/reference/exnextmodulekindExportClassNameWithObject.symbols
new file mode 100644
index 00000000000..2bc0455e162
--- /dev/null
+++ b/tests/baselines/reference/exnextmodulekindExportClassNameWithObject.symbols
@@ -0,0 +1,4 @@
+=== tests/cases/conformance/externalModules/esnext/exnextmodulekindExportClassNameWithObject.ts ===
+export class Object {}
+>Object : Symbol(Object, Decl(exnextmodulekindExportClassNameWithObject.ts, 0, 0))
+
diff --git a/tests/baselines/reference/exnextmodulekindExportClassNameWithObject.types b/tests/baselines/reference/exnextmodulekindExportClassNameWithObject.types
new file mode 100644
index 00000000000..1fbe924a4a0
--- /dev/null
+++ b/tests/baselines/reference/exnextmodulekindExportClassNameWithObject.types
@@ -0,0 +1,4 @@
+=== tests/cases/conformance/externalModules/esnext/exnextmodulekindExportClassNameWithObject.ts ===
+export class Object {}
+>Object : Object
+
diff --git a/tests/baselines/reference/exportAmbientClassNameWithObject.js b/tests/baselines/reference/exportAmbientClassNameWithObject.js
new file mode 100644
index 00000000000..fdad4c7818c
--- /dev/null
+++ b/tests/baselines/reference/exportAmbientClassNameWithObject.js
@@ -0,0 +1,7 @@
+//// [exportAmbientClassNameWithObject.ts]
+export declare class Object {}
+
+
+//// [exportAmbientClassNameWithObject.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
diff --git a/tests/baselines/reference/exportAmbientClassNameWithObject.symbols b/tests/baselines/reference/exportAmbientClassNameWithObject.symbols
new file mode 100644
index 00000000000..6287c91780a
--- /dev/null
+++ b/tests/baselines/reference/exportAmbientClassNameWithObject.symbols
@@ -0,0 +1,4 @@
+=== tests/cases/conformance/externalModules/exportAmbientClassNameWithObject.ts ===
+export declare class Object {}
+>Object : Symbol(Object, Decl(exportAmbientClassNameWithObject.ts, 0, 0))
+
diff --git a/tests/baselines/reference/exportAmbientClassNameWithObject.types b/tests/baselines/reference/exportAmbientClassNameWithObject.types
new file mode 100644
index 00000000000..e85e4eb05db
--- /dev/null
+++ b/tests/baselines/reference/exportAmbientClassNameWithObject.types
@@ -0,0 +1,4 @@
+=== tests/cases/conformance/externalModules/exportAmbientClassNameWithObject.ts ===
+export declare class Object {}
+>Object : Object
+
diff --git a/tests/baselines/reference/exportClassNameWithObjectAMD.errors.txt b/tests/baselines/reference/exportClassNameWithObjectAMD.errors.txt
new file mode 100644
index 00000000000..781a010abb4
--- /dev/null
+++ b/tests/baselines/reference/exportClassNameWithObjectAMD.errors.txt
@@ -0,0 +1,8 @@
+tests/cases/conformance/externalModules/exportClassNameWithObjectAMD.ts(1,14): error TS2717: Class name cannot be 'Object' when targeting ES5 with module AMD.
+
+
+==== tests/cases/conformance/externalModules/exportClassNameWithObjectAMD.ts (1 errors) ====
+    export class Object {}
+                 ~~~~~~
+!!! error TS2717: Class name cannot be 'Object' when targeting ES5 with module AMD.
+    
\ No newline at end of file
diff --git a/tests/baselines/reference/exportClassNameWithObjectAMD.js b/tests/baselines/reference/exportClassNameWithObjectAMD.js
new file mode 100644
index 00000000000..e3403689cbb
--- /dev/null
+++ b/tests/baselines/reference/exportClassNameWithObjectAMD.js
@@ -0,0 +1,15 @@
+//// [exportClassNameWithObjectAMD.ts]
+export class Object {}
+
+
+//// [exportClassNameWithObjectAMD.js]
+define(["require", "exports"], function (require, exports) {
+    "use strict";
+    Object.defineProperty(exports, "__esModule", { value: true });
+    var Object = /** @class */ (function () {
+        function Object() {
+        }
+        return Object;
+    }());
+    exports.Object = Object;
+});
diff --git a/tests/baselines/reference/exportClassNameWithObjectAMD.symbols b/tests/baselines/reference/exportClassNameWithObjectAMD.symbols
new file mode 100644
index 00000000000..eadb0af0ddc
--- /dev/null
+++ b/tests/baselines/reference/exportClassNameWithObjectAMD.symbols
@@ -0,0 +1,4 @@
+=== tests/cases/conformance/externalModules/exportClassNameWithObjectAMD.ts ===
+export class Object {}
+>Object : Symbol(Object, Decl(exportClassNameWithObjectAMD.ts, 0, 0))
+
diff --git a/tests/baselines/reference/exportClassNameWithObjectAMD.types b/tests/baselines/reference/exportClassNameWithObjectAMD.types
new file mode 100644
index 00000000000..7caeadb6e03
--- /dev/null
+++ b/tests/baselines/reference/exportClassNameWithObjectAMD.types
@@ -0,0 +1,4 @@
+=== tests/cases/conformance/externalModules/exportClassNameWithObjectAMD.ts ===
+export class Object {}
+>Object : Object
+
diff --git a/tests/baselines/reference/exportClassNameWithObjectCommonJS.errors.txt b/tests/baselines/reference/exportClassNameWithObjectCommonJS.errors.txt
new file mode 100644
index 00000000000..84ffb7f0f8a
--- /dev/null
+++ b/tests/baselines/reference/exportClassNameWithObjectCommonJS.errors.txt
@@ -0,0 +1,8 @@
+tests/cases/conformance/externalModules/exportClassNameWithObjectCommonJS.ts(1,14): error TS2717: Class name cannot be 'Object' when targeting ES5 with module CommonJS.
+
+
+==== tests/cases/conformance/externalModules/exportClassNameWithObjectCommonJS.ts (1 errors) ====
+    export class Object {}
+                 ~~~~~~
+!!! error TS2717: Class name cannot be 'Object' when targeting ES5 with module CommonJS.
+    
\ No newline at end of file
diff --git a/tests/baselines/reference/exportClassNameWithObjectCommonJS.js b/tests/baselines/reference/exportClassNameWithObjectCommonJS.js
new file mode 100644
index 00000000000..b9e2522b1b2
--- /dev/null
+++ b/tests/baselines/reference/exportClassNameWithObjectCommonJS.js
@@ -0,0 +1,13 @@
+//// [exportClassNameWithObjectCommonJS.ts]
+export class Object {}
+
+
+//// [exportClassNameWithObjectCommonJS.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+var Object = /** @class */ (function () {
+    function Object() {
+    }
+    return Object;
+}());
+exports.Object = Object;
diff --git a/tests/baselines/reference/exportClassNameWithObjectCommonJS.symbols b/tests/baselines/reference/exportClassNameWithObjectCommonJS.symbols
new file mode 100644
index 00000000000..025fa479fd6
--- /dev/null
+++ b/tests/baselines/reference/exportClassNameWithObjectCommonJS.symbols
@@ -0,0 +1,4 @@
+=== tests/cases/conformance/externalModules/exportClassNameWithObjectCommonJS.ts ===
+export class Object {}
+>Object : Symbol(Object, Decl(exportClassNameWithObjectCommonJS.ts, 0, 0))
+
diff --git a/tests/baselines/reference/exportClassNameWithObjectCommonJS.types b/tests/baselines/reference/exportClassNameWithObjectCommonJS.types
new file mode 100644
index 00000000000..38ce8d61d95
--- /dev/null
+++ b/tests/baselines/reference/exportClassNameWithObjectCommonJS.types
@@ -0,0 +1,4 @@
+=== tests/cases/conformance/externalModules/exportClassNameWithObjectCommonJS.ts ===
+export class Object {}
+>Object : Object
+
diff --git a/tests/baselines/reference/exportClassNameWithObjectSystem.errors.txt b/tests/baselines/reference/exportClassNameWithObjectSystem.errors.txt
new file mode 100644
index 00000000000..67a932524bb
--- /dev/null
+++ b/tests/baselines/reference/exportClassNameWithObjectSystem.errors.txt
@@ -0,0 +1,8 @@
+tests/cases/conformance/externalModules/exportClassNameWithObjectSystem.ts(1,14): error TS2717: Class name cannot be 'Object' when targeting ES5 with module System.
+
+
+==== tests/cases/conformance/externalModules/exportClassNameWithObjectSystem.ts (1 errors) ====
+    export class Object {}
+                 ~~~~~~
+!!! error TS2717: Class name cannot be 'Object' when targeting ES5 with module System.
+    
\ No newline at end of file
diff --git a/tests/baselines/reference/exportClassNameWithObjectSystem.js b/tests/baselines/reference/exportClassNameWithObjectSystem.js
new file mode 100644
index 00000000000..6bb9dadaac6
--- /dev/null
+++ b/tests/baselines/reference/exportClassNameWithObjectSystem.js
@@ -0,0 +1,21 @@
+//// [exportClassNameWithObjectSystem.ts]
+export class Object {}
+
+
+//// [exportClassNameWithObjectSystem.js]
+System.register([], function (exports_1, context_1) {
+    "use strict";
+    var __moduleName = context_1 && context_1.id;
+    var Object;
+    return {
+        setters: [],
+        execute: function () {
+            Object = /** @class */ (function () {
+                function Object() {
+                }
+                return Object;
+            }());
+            exports_1("Object", Object);
+        }
+    };
+});
diff --git a/tests/baselines/reference/exportClassNameWithObjectSystem.symbols b/tests/baselines/reference/exportClassNameWithObjectSystem.symbols
new file mode 100644
index 00000000000..5152c2aa637
--- /dev/null
+++ b/tests/baselines/reference/exportClassNameWithObjectSystem.symbols
@@ -0,0 +1,4 @@
+=== tests/cases/conformance/externalModules/exportClassNameWithObjectSystem.ts ===
+export class Object {}
+>Object : Symbol(Object, Decl(exportClassNameWithObjectSystem.ts, 0, 0))
+
diff --git a/tests/baselines/reference/exportClassNameWithObjectSystem.types b/tests/baselines/reference/exportClassNameWithObjectSystem.types
new file mode 100644
index 00000000000..5b6507fd940
--- /dev/null
+++ b/tests/baselines/reference/exportClassNameWithObjectSystem.types
@@ -0,0 +1,4 @@
+=== tests/cases/conformance/externalModules/exportClassNameWithObjectSystem.ts ===
+export class Object {}
+>Object : Object
+
diff --git a/tests/baselines/reference/exportClassNameWithObjectUMD.errors.txt b/tests/baselines/reference/exportClassNameWithObjectUMD.errors.txt
new file mode 100644
index 00000000000..73cd319230b
--- /dev/null
+++ b/tests/baselines/reference/exportClassNameWithObjectUMD.errors.txt
@@ -0,0 +1,8 @@
+tests/cases/conformance/externalModules/exportClassNameWithObjectUMD.ts(1,14): error TS2717: Class name cannot be 'Object' when targeting ES5 with module UMD.
+
+
+==== tests/cases/conformance/externalModules/exportClassNameWithObjectUMD.ts (1 errors) ====
+    export class Object {}
+                 ~~~~~~
+!!! error TS2717: Class name cannot be 'Object' when targeting ES5 with module UMD.
+    
\ No newline at end of file
diff --git a/tests/baselines/reference/exportClassNameWithObjectUMD.js b/tests/baselines/reference/exportClassNameWithObjectUMD.js
new file mode 100644
index 00000000000..1447392c875
--- /dev/null
+++ b/tests/baselines/reference/exportClassNameWithObjectUMD.js
@@ -0,0 +1,23 @@
+//// [exportClassNameWithObjectUMD.ts]
+export class Object {}
+
+
+//// [exportClassNameWithObjectUMD.js]
+(function (factory) {
+    if (typeof module === "object" && typeof module.exports === "object") {
+        var v = factory(require, exports);
+        if (v !== undefined) module.exports = v;
+    }
+    else if (typeof define === "function" && define.amd) {
+        define(["require", "exports"], factory);
+    }
+})(function (require, exports) {
+    "use strict";
+    Object.defineProperty(exports, "__esModule", { value: true });
+    var Object = /** @class */ (function () {
+        function Object() {
+        }
+        return Object;
+    }());
+    exports.Object = Object;
+});
diff --git a/tests/baselines/reference/exportClassNameWithObjectUMD.symbols b/tests/baselines/reference/exportClassNameWithObjectUMD.symbols
new file mode 100644
index 00000000000..05d3eeb8b02
--- /dev/null
+++ b/tests/baselines/reference/exportClassNameWithObjectUMD.symbols
@@ -0,0 +1,4 @@
+=== tests/cases/conformance/externalModules/exportClassNameWithObjectUMD.ts ===
+export class Object {}
+>Object : Symbol(Object, Decl(exportClassNameWithObjectUMD.ts, 0, 0))
+
diff --git a/tests/baselines/reference/exportClassNameWithObjectUMD.types b/tests/baselines/reference/exportClassNameWithObjectUMD.types
new file mode 100644
index 00000000000..42f0198cbaf
--- /dev/null
+++ b/tests/baselines/reference/exportClassNameWithObjectUMD.types
@@ -0,0 +1,4 @@
+=== tests/cases/conformance/externalModules/exportClassNameWithObjectUMD.ts ===
+export class Object {}
+>Object : Object
+
diff --git a/tests/baselines/reference/exportDefaultClassNameWithObject.errors.txt b/tests/baselines/reference/exportDefaultClassNameWithObject.errors.txt
new file mode 100644
index 00000000000..7be181d956b
--- /dev/null
+++ b/tests/baselines/reference/exportDefaultClassNameWithObject.errors.txt
@@ -0,0 +1,8 @@
+tests/cases/conformance/externalModules/exportDefaultClassNameWithObject.ts(1,22): error TS2717: Class name cannot be 'Object' when targeting ES5 with module CommonJS.
+
+
+==== tests/cases/conformance/externalModules/exportDefaultClassNameWithObject.ts (1 errors) ====
+    export default class Object {}
+                         ~~~~~~
+!!! error TS2717: Class name cannot be 'Object' when targeting ES5 with module CommonJS.
+    
\ No newline at end of file
diff --git a/tests/baselines/reference/exportDefaultClassNameWithObject.js b/tests/baselines/reference/exportDefaultClassNameWithObject.js
new file mode 100644
index 00000000000..f5a4ec74a66
--- /dev/null
+++ b/tests/baselines/reference/exportDefaultClassNameWithObject.js
@@ -0,0 +1,13 @@
+//// [exportDefaultClassNameWithObject.ts]
+export default class Object {}
+
+
+//// [exportDefaultClassNameWithObject.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+var Object = /** @class */ (function () {
+    function Object() {
+    }
+    return Object;
+}());
+exports.default = Object;
diff --git a/tests/baselines/reference/exportDefaultClassNameWithObject.symbols b/tests/baselines/reference/exportDefaultClassNameWithObject.symbols
new file mode 100644
index 00000000000..3192dcf73ef
--- /dev/null
+++ b/tests/baselines/reference/exportDefaultClassNameWithObject.symbols
@@ -0,0 +1,4 @@
+=== tests/cases/conformance/externalModules/exportDefaultClassNameWithObject.ts ===
+export default class Object {}
+>Object : Symbol(Object, Decl(exportDefaultClassNameWithObject.ts, 0, 0))
+
diff --git a/tests/baselines/reference/exportDefaultClassNameWithObject.types b/tests/baselines/reference/exportDefaultClassNameWithObject.types
new file mode 100644
index 00000000000..547164703d0
--- /dev/null
+++ b/tests/baselines/reference/exportDefaultClassNameWithObject.types
@@ -0,0 +1,4 @@
+=== tests/cases/conformance/externalModules/exportDefaultClassNameWithObject.ts ===
+export default class Object {}
+>Object : Object
+
diff --git a/tests/cases/conformance/externalModules/es6/es6modulekindExportClassNameWithObject.ts b/tests/cases/conformance/externalModules/es6/es6modulekindExportClassNameWithObject.ts
new file mode 100644
index 00000000000..40de8852ff1
--- /dev/null
+++ b/tests/cases/conformance/externalModules/es6/es6modulekindExportClassNameWithObject.ts
@@ -0,0 +1,3 @@
+// @target: ES5
+// @module: es2015
+export class Object {}
diff --git a/tests/cases/conformance/externalModules/esnext/exnextmodulekindExportClassNameWithObject.ts b/tests/cases/conformance/externalModules/esnext/exnextmodulekindExportClassNameWithObject.ts
new file mode 100644
index 00000000000..440bfe080d4
--- /dev/null
+++ b/tests/cases/conformance/externalModules/esnext/exnextmodulekindExportClassNameWithObject.ts
@@ -0,0 +1,3 @@
+// @target: ES5
+// @module: esnext
+export class Object {}
diff --git a/tests/cases/conformance/externalModules/exportAmbientClassNameWithObject.ts b/tests/cases/conformance/externalModules/exportAmbientClassNameWithObject.ts
new file mode 100644
index 00000000000..3262ecdd3a5
--- /dev/null
+++ b/tests/cases/conformance/externalModules/exportAmbientClassNameWithObject.ts
@@ -0,0 +1,2 @@
+// @target: ES5
+export declare class Object {}
diff --git a/tests/cases/conformance/externalModules/exportClassNameWithObjectAMD.ts b/tests/cases/conformance/externalModules/exportClassNameWithObjectAMD.ts
new file mode 100644
index 00000000000..529924b4a4f
--- /dev/null
+++ b/tests/cases/conformance/externalModules/exportClassNameWithObjectAMD.ts
@@ -0,0 +1,3 @@
+// @target: ES5
+// @module: amd
+export class Object {}
diff --git a/tests/cases/conformance/externalModules/exportClassNameWithObjectCommonJS.ts b/tests/cases/conformance/externalModules/exportClassNameWithObjectCommonJS.ts
new file mode 100644
index 00000000000..676e275dfbd
--- /dev/null
+++ b/tests/cases/conformance/externalModules/exportClassNameWithObjectCommonJS.ts
@@ -0,0 +1,3 @@
+// @target: ES5
+// @module: commonjs
+export class Object {}
diff --git a/tests/cases/conformance/externalModules/exportClassNameWithObjectSystem.ts b/tests/cases/conformance/externalModules/exportClassNameWithObjectSystem.ts
new file mode 100644
index 00000000000..6d23d7e1e3b
--- /dev/null
+++ b/tests/cases/conformance/externalModules/exportClassNameWithObjectSystem.ts
@@ -0,0 +1,3 @@
+// @target: ES5
+// @module: system
+export class Object {}
diff --git a/tests/cases/conformance/externalModules/exportClassNameWithObjectUMD.ts b/tests/cases/conformance/externalModules/exportClassNameWithObjectUMD.ts
new file mode 100644
index 00000000000..d2cb221a069
--- /dev/null
+++ b/tests/cases/conformance/externalModules/exportClassNameWithObjectUMD.ts
@@ -0,0 +1,3 @@
+// @target: ES5
+// @module: umd
+export class Object {}
diff --git a/tests/cases/conformance/externalModules/exportDefaultClassNameWithObject.ts b/tests/cases/conformance/externalModules/exportDefaultClassNameWithObject.ts
new file mode 100644
index 00000000000..75a5a33ac06
--- /dev/null
+++ b/tests/cases/conformance/externalModules/exportDefaultClassNameWithObject.ts
@@ -0,0 +1,2 @@
+// @target: ES5
+export default class Object {}