Hallahan is a surname. Notable people with the surname include:

  • Bill Hallahan (1902–1981), American left-handed pitcher in Major League Baseball
  • Cathriona Hallahan (born 1964/1965), Irish business executive and the managing director of Microsoft Ireland
  • Charles Hallahan (1943–1997), American actor
  • Jim Hallahan Jr. (1911–1994), Australian rules footballer, played for the Footscray and the Fitzroy Football Club
  • Jim Hallahan Sr. (1878–1964), Australian rules footballer, played for the St Kilda Football Club
  • Kay Hallahan (born 1941), former deputy leader of the Western Australian branch of the Australian Labor Party
  • Margaret Hallahan (born 1803), English Catholic nun, foundress of the Dominican Congregation of St. Catherine of Siena
  • Mike Hallahan (born 1949), Australian rules footballer, played for the Fitzroy Football Club
  • Mitch Hallahan (born 1992), Australian rules footballer, played for the Hawthorn and the Gold Coast Football Club
  • William H. Hallahan (1925–2018), American Edgar-award-winning novelist
  • Tom Hallahan (1908–1997), Australian rules footballer, played for the Collingwood and St Kilda Football Club

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