Aideen Nicholson (April 29, 1927 – May 31, 2019) was an Irish-born social worker and Canadian politician.
A social worker by profession, Nicholson worked at the Hospital for Sick Children in Toronto, taught at George Brown College and the University of Toronto and also worked at Ontario Correctional Services and as a founding member of the Ontario Commission on the Status of Women.
[1] She entered politics in the 1974 federal election, defeating Paul Hellyer in the riding of Trinity in Toronto and was re-elected three times as a Liberal.
She served as parliamentary secretary for several years: Nicholson was on the Liberal front bench after the party entered the opposition as a result of the 1984 federal election.
The nomination was contested by Paul Hellyer, whom Nicholson had defeated when he ran as a Tory in 1974 but who had rejoined the Liberals in 1982.