Daniel O'Leary (1875 – 23 December 1954) was an Irish nationalist politician and Member of Parliament (MP) in the House of Commons of the United Kingdom of Great Britain and Ireland.

He was stood for election unsuccessfully as the Irish Parliamentary Party candidate for the West Cork constituency at the January 1910 and December 1910 general elections. O'Leary was elected at November 1916 West Cork by-election, following the death of the incumbent All-for-Ireland League MP, James Gilhooly. He did not contest the 1918 general election.

• Hansard 1803–2005: contributions in Parliament by Daniel O'Leary

• "O'Leary, Daniel Henry" . Thom's Irish Who's Who . Dublin: Alexander Thom and Son Ltd. 1923. p. 191  – via Wikisource.

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