diff --git a/desktop/flipper-plugin/src/__tests__/api.node.tsx b/desktop/flipper-plugin/src/__tests__/api.node.tsx
index f4fa490e3..787c5ff30 100644
--- a/desktop/flipper-plugin/src/__tests__/api.node.tsx
+++ b/desktop/flipper-plugin/src/__tests__/api.node.tsx
@@ -43,6 +43,7 @@ test('Correct top level API exposed', () => {
       "MasterDetail",
       "NUX",
       "Panel",
+      "Spinner",
       "Tab",
       "Tabs",
       "TestUtils",
diff --git a/desktop/flipper-plugin/src/index.ts b/desktop/flipper-plugin/src/index.ts
index 604f4cd38..0ce137713 100644
--- a/desktop/flipper-plugin/src/index.ts
+++ b/desktop/flipper-plugin/src/index.ts
@@ -92,6 +92,7 @@ export {createDataSource} from './state/createDataSource';
 export {DataTable, DataTableColumn} from './ui/data-table/DataTable';
 export {DataTableManager} from './ui/data-table/DataTableManager';
 export {DataList} from './ui/DataList';
+export {Spinner} from './ui/Spinner';
 
 export {
   Interactive as _Interactive,
diff --git a/desktop/flipper-plugin/src/ui/Dialog.tsx b/desktop/flipper-plugin/src/ui/Dialog.tsx
index d6fc1907b..31542ca6b 100644
--- a/desktop/flipper-plugin/src/ui/Dialog.tsx
+++ b/desktop/flipper-plugin/src/ui/Dialog.tsx
@@ -12,6 +12,7 @@ import {Atom, createState, useValue} from '../state/atom';
 import React from 'react';
 import {renderReactRoot} from '../utils/renderReactRoot';
 import {Layout} from './Layout';
+import {Spinner} from './Spinner';
 
 type DialogResult<T> = Promise<false | T> & {close: () => void};
 
@@ -19,8 +20,11 @@ type BaseDialogOptions = {
   title: string;
   okText?: string;
   cancelText?: string;
+  width?: number;
 };
 
+const defaultWidth = 400;
+
 export const Dialog = {
   show<T>(
     opts: BaseDialogOptions & {
@@ -54,7 +58,7 @@ export const Dialog = {
                 }
               }}
               onCancel={cancel}
-              width={400}>
+              width={opts.width ?? defaultWidth}>
               <Layout.Container gap>
                 {opts.children}
                 <SubmissionError submissionError={submissionError} />
@@ -112,6 +116,47 @@ export const Dialog = {
       },
     });
   },
+
+  loading({
+    title,
+    message,
+    width,
+  }: {
+    title?: string;
+    message: string | React.ReactElement;
+    width?: number;
+  }) {
+    let cancel: () => void;
+
+    return Object.assign(
+      new Promise<void>((resolve) => {
+        renderReactRoot((hide) => {
+          cancel = () => {
+            hide();
+            resolve();
+          };
+          return (
+            <Modal
+              title={title ?? 'Loading...'}
+              visible
+              footer={null}
+              width={width ?? defaultWidth}
+              closable={false}>
+              <Layout.Container gap center>
+                <Spinner />
+                {message}
+              </Layout.Container>
+            </Modal>
+          );
+        });
+      }),
+      {
+        close() {
+          cancel();
+        },
+      },
+    );
+  },
 };
 
 function PromptInput({inputValue}: {inputValue: Atom<string>}) {
diff --git a/desktop/flipper-plugin/src/ui/Spinner.tsx b/desktop/flipper-plugin/src/ui/Spinner.tsx
new file mode 100644
index 000000000..5c0718071
--- /dev/null
+++ b/desktop/flipper-plugin/src/ui/Spinner.tsx
@@ -0,0 +1,18 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @format
+ */
+
+import {LoadingOutlined} from '@ant-design/icons';
+import {Spin} from 'antd';
+import React from 'react';
+
+export function Spinner({size}: {size?: number}) {
+  return (
+    <Spin indicator={<LoadingOutlined style={{fontSize: size ?? 24}} spin />} />
+  );
+}
diff --git a/docs/extending/flipper-plugin.mdx b/docs/extending/flipper-plugin.mdx
index 271cdb5dc..bf8c8641d 100644
--- a/docs/extending/flipper-plugin.mdx
+++ b/docs/extending/flipper-plugin.mdx
@@ -918,10 +918,15 @@ Available utilities
   * `message`: Text accompanying the input
   * `defaultValue`
   * `onConfirm(value) => Promise<string>`. Can be used to transform the inputted value before resolving the prompt promise. If the handler throws, this will be shown as validation error in the dialog.
+* `Dialog.loading(options): Promise<void>`. Shows a dialog with a loading spinner. This dialog cannot be closed by the user, so instead `.close()` should be called programmatically on the returned promise.
+  * `message`: Message to display with the loading spinner.
 * `Dialog.show<T>(options): Promise<T | false`. Low level building block to build dialogs. Options:
   * `children`: React Element to render as children of the dialog.
   * `onConfirm: () => Promise<T>`. Handler to handle the OK button, which should produce the value the `Dialog.show` call will resolve to.
 
+### Spinner
+
+Shows a loading spinner. Accept an optional `size` to make the spinner larger / smaller.
 
 ### NUX