Henrietta Butler, Viscountess Galmoye, previously Henrietta Waldegrave, Baroness Waldegrave (née Lady Henrietta FitzJames; 1667 – 3 April 1730), was an illegitimate daughter of James Stuart, Duke of York, subsequently King of England, Scotland and Ireland, by his mistress, Arabella Churchill (a sister of the first Duke of Marlborough).
Upon marrying, she became Lady Waldegrave, and then with her second marriage Viscountess Galmoye, as well as Countess of Newcastle (in the Jacobite Peerage).
She was the older sister of the celebrated James FitzJames, 1st Duke of Berwick.
After her husband's death in 1689, she was involved with an Irish soldier, Mark Talbot.
She subsequently married Piers Butler, 3rd Viscount Galmoye, on 3 April 1695.