diff --git a/src/design-system/composites/LoginForm/LoginDialog.test.tsx b/src/design-system/composites/LoginForm/LoginDialog.test.tsx
new file mode 100644
index 0000000..6e486d0
--- /dev/null
+++ b/src/design-system/composites/LoginForm/LoginDialog.test.tsx
@@ -0,0 +1,54 @@
+import { describe, it, expect, vi } from 'vitest'
+import { render, screen } from '@testing-library/react'
+import userEvent from '@testing-library/user-event'
+import { LoginDialog } from './LoginDialog'
+
+const defaultProps = {
+  open: true,
+  onClose: vi.fn(),
+  onSubmit: vi.fn(),
+}
+
+describe('LoginDialog', () => {
+  it('renders Modal with LoginForm when open', () => {
+    render(<LoginDialog {...defaultProps} />)
+    expect(screen.getByRole('dialog')).toBeInTheDocument()
+    expect(screen.getByRole('heading', { name: 'Sign in' })).toBeInTheDocument()
+    expect(screen.getByLabelText(/email/i)).toBeInTheDocument()
+  })
+
+  it('does not render when closed', () => {
+    render(<LoginDialog {...defaultProps} open={false} />)
+    expect(screen.queryByRole('dialog')).not.toBeInTheDocument()
+  })
+
+  it('calls onClose on Esc', async () => {
+    const onClose = vi.fn()
+    const user = userEvent.setup()
+    render(<LoginDialog {...defaultProps} onClose={onClose} />)
+    await user.keyboard('{Escape}')
+    expect(onClose).toHaveBeenCalled()
+  })
+
+  it('calls onClose on backdrop click', async () => {
+    const onClose = vi.fn()
+    const user = userEvent.setup()
+    render(<LoginDialog {...defaultProps} onClose={onClose} />)
+    await user.click(screen.getByTestId('modal-backdrop'))
+    expect(onClose).toHaveBeenCalled()
+  })
+
+  it('passes LoginForm props through', () => {
+    render(
+      <LoginDialog
+        {...defaultProps}
+        title="Welcome"
+        socialProviders={[{ label: 'Continue with Google', onClick: vi.fn() }]}
+        error="Bad credentials"
+      />,
+    )
+    expect(screen.getByText('Welcome')).toBeInTheDocument()
+    expect(screen.getByText('Continue with Google')).toBeInTheDocument()
+    expect(screen.getByText('Bad credentials')).toBeInTheDocument()
+  })
+})
diff --git a/src/design-system/composites/LoginForm/LoginDialog.tsx b/src/design-system/composites/LoginForm/LoginDialog.tsx
new file mode 100644
index 0000000..cffd740
--- /dev/null
+++ b/src/design-system/composites/LoginForm/LoginDialog.tsx
@@ -0,0 +1,15 @@
+import { Modal } from '../Modal/Modal'
+import { LoginForm, type LoginFormProps } from './LoginForm'
+
+export interface LoginDialogProps extends LoginFormProps {
+  open: boolean
+  onClose: () => void
+}
+
+export function LoginDialog({ open, onClose, className, ...formProps }: LoginDialogProps) {
+  return (
+    <Modal open={open} onClose={onClose} size="sm" className={className}>
+      <LoginForm {...formProps} />
+    </Modal>
+  )
+}