William O'Leary (4 October 1894 – 27 November 1955) was an Irish Fianna Fáil politician.

Following the signing of the Anglo-Irish Treaty he fought on the anti-treaty side in the Irish Civil War.

He had been elected to Kerry County Council in 1928, and held his seat until his death.

[7] When the Agricultural Wages Board was formed in 1937 he was named as chairman,[8] a post he held until his death.

He died at a nursing home in Rathmines on 27 November 1955, aged 61,[9][10] and was buried in Mulhuddart Cemetery.