Cyril Tait O'Callaghan (9 September 1889 — 6 April 1984) was an Irish international rugby union player.
Born in Carlow, O'Callaghan was a wing three-quarter and played for Old Merchant Taylors, an English club. He gained seven Ireland caps, debuting in 1910, and scored two tries, both during the 1911 Five Nations.[1]