diff --git a/package.json b/package.json
index db53b10032..afa62b90e8 100644
--- a/package.json
+++ b/package.json
@@ -32,6 +32,7 @@
     "onCommand:PowerShell.NewProjectFromTemplate",
     "onCommand:PowerShell.OpenExamplesFolder",
     "onCommand:PowerShell.PickPSHostProcess",
+    "onCommand:PowerShell.PickRunspace",
     "onCommand:PowerShell.SpecifyScriptArgs",
     "onCommand:PowerShell.ShowSessionConsole",
     "onCommand:PowerShell.ShowSessionMenu",
@@ -318,6 +319,7 @@
         "runtime": "node",
         "variables": {
           "PickPSHostProcess": "PowerShell.PickPSHostProcess",
+          "PickRunspace": "PowerShell.PickRunspace",
           "SpecifyScriptArgs": "PowerShell.SpecifyScriptArgs"
         },
         "languages": [
@@ -406,6 +408,16 @@
               "request": "launch",
               "cwd": ""
             }
+          },
+          {
+            "label": "PowerShell: Attach Interactive Session Runspace",
+            "description": "Open runspace picker to select runspace to attach debugger to",
+            "body": {
+              "name": "PowerShell Attach Interactive Session Runspace",
+              "type": "PowerShell",
+              "request": "attach",
+              "processId": "current"
+            }
           }
         ],
         "configurationAttributes": {
@@ -447,9 +459,9 @@
                 "default": null
               },
               "runspaceId": {
-                "type": "number",
+                "type":["string","number"],
                 "description": "Optional: The ID of the runspace to debug in the attached process.  Defaults to 1.  Works only on PowerShell 5 and above.",
-                "default": 1
+                "default": null
               },
               "customPipeName": {
                 "type": "string",
@@ -490,14 +502,19 @@
           {
             "name": "PowerShell Attach to Host Process",
             "type": "PowerShell",
-            "request": "attach",
-            "runspaceId": 1
+            "request": "attach"
           },
           {
             "name": "PowerShell Interactive Session",
             "type": "PowerShell",
             "request": "launch",
             "cwd": ""
+          },
+          {
+            "name": "PowerShell Attach Interactive Session Runspace",
+            "type": "PowerShell",
+            "request": "attach",
+            "processId": "current"
           }
         ]
       }
diff --git a/src/features/DebugSession.ts b/src/features/DebugSession.ts
index 0cfbefc17f..1c071af8ee 100644
--- a/src/features/DebugSession.ts
+++ b/src/features/DebugSession.ts
@@ -80,6 +80,20 @@ export class DebugSessionFeature implements IFeature, DebugConfigurationProvider
             // if nothing is set, prompt for the processId
             if (!config.customPipeName && !config.processId) {
                 config.processId = await vscode.commands.executeCommand("PowerShell.PickPSHostProcess");
+
+                // No process selected. Cancel attach.
+                if (!config.processId) {
+                    return null;
+                }
+            }
+
+            if (!config.runspaceId) {
+                config.runspaceId = await vscode.commands.executeCommand("PowerShell.PickRunspace", config.processId);
+
+                // No runspace selected. Cancel attach.
+                if (!config.runspaceId) {
+                    return null;
+                }
             }
         }
 
@@ -386,3 +400,122 @@ export class PickPSHostProcessFeature implements IFeature {
         }
     }
 }
+
+interface IRunspaceItem extends vscode.QuickPickItem {
+    id: string;	// payload for the QuickPick UI
+}
+
+interface IRunspace {
+    id: number;
+    name: string;
+    availability: string;
+}
+
+export const GetRunspaceRequestType =
+    new RequestType<any, IRunspace[], string, void>("powerShell/getRunspace");
+
+export class PickRunspaceFeature implements IFeature {
+
+    private command: vscode.Disposable;
+    private languageClient: LanguageClient;
+    private waitingForClientToken: vscode.CancellationTokenSource;
+    private getLanguageClientResolve: (value?: LanguageClient | Thenable<LanguageClient>) => void;
+
+    constructor() {
+        this.command =
+            vscode.commands.registerCommand("PowerShell.PickRunspace", (processId) => {
+                return this.getLanguageClient()
+                           .then((_) => this.pickRunspace(processId), (_) => undefined);
+            }, this);
+    }
+
+    public setLanguageClient(languageClient: LanguageClient) {
+        this.languageClient = languageClient;
+
+        if (this.waitingForClientToken) {
+            this.getLanguageClientResolve(this.languageClient);
+            this.clearWaitingToken();
+        }
+    }
+
+    public dispose() {
+        this.command.dispose();
+    }
+
+    private getLanguageClient(): Thenable<LanguageClient> {
+        if (this.languageClient) {
+            return Promise.resolve(this.languageClient);
+        } else {
+            // If PowerShell isn't finished loading yet, show a loading message
+            // until the LanguageClient is passed on to us
+            this.waitingForClientToken = new vscode.CancellationTokenSource();
+
+            return new Promise<LanguageClient>(
+                (resolve, reject) => {
+                    this.getLanguageClientResolve = resolve;
+
+                    vscode.window
+                        .showQuickPick(
+                            ["Cancel"],
+                            { placeHolder: "Attach to PowerShell host process: Please wait, starting PowerShell..." },
+                            this.waitingForClientToken.token)
+                        .then((response) => {
+                            if (response === "Cancel") {
+                                this.clearWaitingToken();
+                                reject();
+                            }
+                        });
+
+                    // Cancel the loading prompt after 60 seconds
+                    setTimeout(() => {
+                        if (this.waitingForClientToken) {
+                            this.clearWaitingToken();
+                            reject();
+
+                            vscode.window.showErrorMessage(
+                                "Attach to PowerShell host process: PowerShell session took too long to start.");
+                        }
+                    }, 60000);
+                },
+            );
+        }
+    }
+
+    private pickRunspace(processId): Thenable<string> {
+        return this.languageClient.sendRequest(GetRunspaceRequestType, processId).then((response) => {
+            const items: IRunspaceItem[] = [];
+
+            for (const runspace of response) {
+                // Skip default runspace
+                if (runspace.id === 1 || runspace.name === "PSAttachRunspace") {
+                    continue;
+                }
+
+                items.push({
+                    label: runspace.name,
+                    description: `ID: ${runspace.id} - ${runspace.availability}`,
+                    id: runspace.id.toString(),
+                });
+            }
+
+            const options: vscode.QuickPickOptions = {
+                placeHolder: "Select PowerShell runspace to debug",
+                matchOnDescription: true,
+                matchOnDetail: true,
+            };
+
+            return vscode.window.showQuickPick(items, options).then((item) => {
+                // Return undefined when user presses Esc.
+                // This prevents VSCode from opening launch.json in this case which happens if we return "".
+                return item ? `${item.id}` : undefined;
+            });
+        });
+    }
+
+    private clearWaitingToken() {
+        if (this.waitingForClientToken) {
+            this.waitingForClientToken.dispose();
+            this.waitingForClientToken = undefined;
+        }
+    }
+}
diff --git a/src/main.ts b/src/main.ts
index b6166556cc..84e03f1608 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -13,6 +13,7 @@ import { ConsoleFeature } from "./features/Console";
 import { CustomViewsFeature } from "./features/CustomViews";
 import { DebugSessionFeature } from "./features/DebugSession";
 import { PickPSHostProcessFeature } from "./features/DebugSession";
+import { PickRunspaceFeature } from "./features/DebugSession";
 import { SpecifyScriptArgsFeature } from "./features/DebugSession";
 import { DocumentFormatterFeature } from "./features/DocumentFormatter";
 import { ExamplesFeature } from "./features/Examples";
@@ -142,6 +143,7 @@ export function activate(context: vscode.ExtensionContext): void {
         new SpecifyScriptArgsFeature(context),
         new HelpCompletionFeature(logger),
         new CustomViewsFeature(),
+        new PickRunspaceFeature(),
     ];
 
     sessionManager.setExtensionFeatures(extensionFeatures);