Katie Walsh (born 18 December 1984) is an Irish jockey who, in 2012, came third in that year's Grand National on Seabass, giving her the highest finish for a female competitor. Walsh is the daughter of amateur jump jockey, trainer and television pundit, Ted Walsh and the sister of top class jump jockey, Ruby Walsh. To date she has ridden two winners at the Cheltenham festival. She began her riding career in 2003.
On 6 April 2015, Walsh became the third woman to win the Irish Grand National riding Thunder And Roses. She was previously successful in the sport of Eventing.
Walsh is a racing ambassador for the Grand National Festival at Aintree Racecourse
Walsh married her long-time partner, the race horse trainer Ross O’Sullivan in Kildare in July 2013. Her sister-in-law is the Irish jockey Nina Carberry, who married Walsh's brother Ted Walsh Junior.