Stay Thirsty (foaled on 29 March 2008) is an American Thoroughbred racehorse sired by the leading stallion Bernardini. He was bred in Kentucky by John D. Gunther and John Darren Gunther. His dam, Marozia, was sired by Storm Bird. Stay Thirsty was consigned as lot 1147 by Glenwood Farm to the 2009 Keeneland September yearling auction and was bought for $160,000 by Whitehorse Stables. His trainer, Todd Pletcher, bought him for his owner, Mike Repole, for $500,000 at the 2010 Fasig-Tipton sale of 2-year-olds in training in Florida.