Mary Stewart, Viscountess Mountjoy (1654–1720), formerly the Honourable Mary Coote, was the wife of William Stewart, 1st Viscount Mountjoy. She was the daughter of Richard Coote, 1st Baron Coote (1620-1683), and his wife, the former Mary St George. Her brother was Richard Coote, 1st Earl of Bellomont.
- Citizenship
- Kingdom of Great Britain
- Born
- 1651
- Died
- 1720
