Lady Mary Boscawen (née Wentworth-Fitzwilliam; (9 January 1845 – 1 July 1921) was a British aristocrat from the Fitzwilliam family.

Lady Mary was born in January 1845 at Milton Hall in Northamptonshire,[1][2] to William Wentworth-Fitzwilliam, Viscount Milton (later 6th Earl Fitzwilliam) and Lady Frances Harriet Douglas, daughter of George Douglas, 17th Earl of Morton.

[4] Rosarian Henry Bennett (1823–1890) named the cultivar rosa 'Lady Mary Fitzwilliam' [fr], a hybrid tea rose, in her honour in 1882.

[5][6] She died in 1921 at Lakeen Cottage in Shillelagh, County Wicklow, Ireland.

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