Martin Brennan may refer to:

• Martin Brennan (Irish politician) (1903–1967), Irish medical practitioner and Fianna Fáil politician, TD from 1938–1948
• Martin Brennan (engineer), computer engineer who worked for Sinclair Research and Atari
• Martin A. Brennan (1879–1941), U.S. Representative from Illinois
• Martin Brennan (hurler) (born 1946), Irish retired sportsperson
• Martin Stanislaus Brennan (1845–1927), American Roman Catholic priest and scientist
• Martin Brennan (footballer) (born 1982), English footballer

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• Thomas Aquinas Maguire
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• Thomas Archer (actor)
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• Thomas Archer Hirst