Thomas or Tom O'Hara may refer to:
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Thomas O'Hara (politician) (1911–1984), Irish politician, merchant and auctioneer
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Tom O'Hara (runner) (1942–2019), American runner
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Thomas J. O'Hara (born 1949), American Catholic priest
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Tom O'Hara (baseball) (1880–1954), American outfielder in Major League Baseball
*Tom O'Hara, character in ''
The 13th Man''
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Tommy O'Hara (1952–2016), Scottish footballer
{{hndis, Ohara, Thomas