O'Reilly (24 August 1993 – 31 December 2014[1]) was a New Zealand bred and trained thoroughbred racehorse who won two Group 1 races.

[2] 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.

O'Reilly was initially placed with Melbourne trainer, Gerald Ryan, but due to injuries was put out to paddock for eight months.

In the November 1996 Bayer Classic Group 1 event for 3 year old horses at Otaki, he beat High Return and Rebel.

[citation needed] O'Reilly has produced 15 individual Group One winners: c = colt, f = filly, g = gelding He was New Zealand's top sire in 2007/08, 2011/12, 2012/13, and 2013/14.