Thomas H. Cullen (1868–1944), United States Representative from New York
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Gordon Cullen (1914–1994), British architect and urban designer, full name Thomas Gordon Cullen
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Thomas R. Cullen (1904–1984), Canadian politician from Prince Edward Island
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Thomas Stephen Cullen (1868–1953), Canadian gynecologist associated with Johns Hopkins Hospital
Thomas Jefferson | Thomas Edison | Thomas | Thomas Hardy | Thomas Mann | Thomas Aquinas | Clarence Thomas | Thomas Gainsborough | Dylan Thomas | Thomas Pynchon | St. Thomas | Saint Thomas, U.S. Virgin Islands | Thomas Carlyle | Thomas the Tank Engine | Thomas Moore | Thomas Cromwell | Thomas Becket | Thomas the Apostle | Thomas Merton | Thomas Tallis | Thomas Paine | Roy Thomas | Thomas Telford | Thomas More | Thomas Wentworth, 1st Earl of Strafford | Ryan Thomas | C. Thomas Howell | Thomas Kean | Thomas Gage | Thomas Eakins |