O'Reilly (24 August 1993 - 31 December 2014) was a New Zealand bred and trained thoroughbred racehorse who won two Group 1 races. O'Reilly was bred by Waikato Stud Holdings Limited. His dam, Courtza, was the winner of the 1989 Golden Slipper Stakes. He was named after the Irish international rugby player and businessman Tony O'Reilly. He was entered in the 1995 Karaka Yearling Sales but was unable to be sold when he failed a veterinary test, due to an abnormality in his larynx, so he was retained by his owner, Gary Chittick.