diff --git a/src/vs/vscode.proposed.d.ts b/src/vs/vscode.proposed.d.ts
index b010b799b11..a3d42a81f89 100644
--- a/src/vs/vscode.proposed.d.ts
+++ b/src/vs/vscode.proposed.d.ts
@@ -1313,6 +1313,7 @@ declare module 'vscode' {
 	}
 
 	export interface NotebookCell {
+		readonly index: number;
 		readonly notebook: NotebookDocument;
 		readonly uri: Uri;
 		readonly cellKind: CellKind;
diff --git a/src/vs/workbench/api/common/extHostNotebookDocument.ts b/src/vs/workbench/api/common/extHostNotebookDocument.ts
index c7136fa76d8..c881d9a5d36 100644
--- a/src/vs/workbench/api/common/extHostNotebookDocument.ts
+++ b/src/vs/workbench/api/common/extHostNotebookDocument.ts
@@ -115,6 +115,7 @@ export class ExtHostCell extends Disposable {
 			const that = this;
 			const document = this._extHostDocument.getDocument(this.uri)!.document;
 			this._cell = Object.freeze({
+				get index() { return that._notebook.getCellIndex(that); },
 				notebook: that._notebook.notebookDocument,
 				uri: that.uri,
 				cellKind: this._cellData.cellKind,
@@ -487,6 +488,9 @@ export class ExtHostNotebookDocument extends Disposable {
 		return this._cells.find(cell => cell.handle === cellHandle);
 	}
 
+	getCellIndex(cell: ExtHostCell): number {
+		return this._cells.indexOf(cell);
+	}
 
 	addEdit(item: vscode.NotebookDocumentEditEvent): number {
 		return this._edits.add([item]);
diff --git a/src/vs/workbench/test/browser/api/extHostNotebook.test.ts b/src/vs/workbench/test/browser/api/extHostNotebook.test.ts
index 95fffee5ecf..1bdb68cac39 100644
--- a/src/vs/workbench/test/browser/api/extHostNotebook.test.ts
+++ b/src/vs/workbench/test/browser/api/extHostNotebook.test.ts
@@ -257,4 +257,51 @@ suite('NotebookCell#Document', function () {
 			assert.equal(cells.document.notebook === notebook.notebookDocument, true);
 		}
 	});
+
+	test('cell#index', function () {
+
+		assert.equal(notebook.notebookDocument.cells.length, 2);
+		const [first, second] = notebook.notebookDocument.cells;
+		assert.equal(first.index, 0);
+		assert.equal(second.index, 1);
+
+		// remove first cell
+		extHostNotebooks.$acceptModelChanged(notebook.uri, {
+			versionId: notebook.notebookDocument.version + 1,
+			rawEvents: [{
+				kind: NotebookCellsChangeType.ModelChange,
+				changes: [[0, 1, []]]
+			}]
+		}, false);
+
+		assert.equal(notebook.notebookDocument.cells.length, 1);
+		assert.equal(second.index, 0);
+
+		extHostNotebooks.$acceptModelChanged(notebookUri, {
+			versionId: notebook.notebookDocument.version + 1,
+			rawEvents: [{
+				kind: NotebookCellsChangeType.ModelChange,
+				changes: [[0, 0, [{
+					handle: 2,
+					uri: CellUri.generate(notebookUri, 2),
+					source: ['Hello', 'World', 'Hello World!'],
+					eol: '\n',
+					language: 'test',
+					cellKind: CellKind.Code,
+					outputs: [],
+				}, {
+					handle: 3,
+					uri: CellUri.generate(notebookUri, 3),
+					source: ['Hallo', 'Welt', 'Hallo Welt!'],
+					eol: '\n',
+					language: 'test',
+					cellKind: CellKind.Code,
+					outputs: [],
+				}]]]
+			}]
+		}, false);
+
+		assert.equal(notebook.notebookDocument.cells.length, 3);
+		assert.equal(second.index, 2);
+	});
 });