Sheahan is a surname. Notable people with the surname include:
Bill Sheahan (umpire) (born 1953), Australian Test cricket match umpireBill Sheahan (politician) (1895–1975), Australian politicianFrank D. Sheahan (1901-1974), American politicianFrankie Sheahan (born 1976), rugby playerJohn Sheahan (born 1939), Irish violinist and folk musicianMaurie Sheahan (1905–1956), Australian rules footballerMike Sheahan (born 1945), Australian journalistPaul Sheahan (born 1946), Australian Test cricketerRiley Sheahan (born 1991), Canadian ice hockey playerTom Sheahan (born 1968), Irish Fine Gael politician