Leopold Macaulay (1887 – 1979) was a Canadian politician and lawyer.

Macaulay was a Conservative member of the Ontario legislature. He was first elected as MPP for the Toronto area riding of York South in 1926. He was brought into the cabinet as Provincial Secretary and Registrar in September 1930 in the last few weeks of the administration of Ontario Premier George Ferguson and was retained in that position when Ferguson's successor, George Henry formed his cabinet in December. Macaulay went on to serve as Minister of Highways from 1931 to 1934 and concurrently served as Minister of Public Works for the last months before the defeat of the Henry government by Mitchell Hepburn's Ontario Liberal Party in the 1934 Ontario election.

Macaulay kept his seat through the election and, in 1936 he was a candidate in the Ontario Conservative leadership convention placing fourth. He remained in the legislature until losing his seat in the 1943 Ontario election to Ontario CCF leader Ted Jolliffe.

He also served on the Board of Regents of Victoria University, University of Toronto from 1932 to 1972 serving as chair from 1951 to 1958.