Mary Donaldson, Lady Donaldson of Lymington

Dorothy Mary Donaldson, Baroness Donaldson of Lymington (née Warwick; 29 August 1921 – 4 October 2003), previously known as Dame Mary Donaldson, was the first female Lord Mayor of London (1983–84).

Born at Wickham, Hampshire, the daughter of an ironmonger and a school teacher, Donaldson trained as a nurse during the war and qualified in 1946.

From 1967 to 1969, she chaired the Women's National Cancer Control Campaign, and then served as the vice president of the British Cancer Council. In 1966, she was elected a member of the City of London Court of Common Council, and became the first female alderman in 1975, the first female Sheriff of the City of London in 1981 and in 1983 the first female Lord Mayor.

Family Donaldson was the wife of John Donaldson, Baron Donaldson of Lymington, who was Master of the Rolls (1982–92); they married in 1945 and had two daughters and a son.