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.
[1] Her brother was Richard Coote, 1st Earl of Bellomont.
The viscount and viscountess had six sons and two daughters, including:[2]