Running Water (foaled 1903 at Runnymede Farm near Paris, Kentucky) was an American Champion Thoroughbred racemare.
Running Water's mare was Breakwater whose sire was Hindoo, a three-time U.S. Champion, the 1881 Kentucky Derby winner and a U.S.
In winning the Merchants and Citizens Handicap she set a new Saratoga Race Course track record while beating the highly touted John Madden-trained colt Dandelion as well as Preakness Stakes and Brooklyn Derby winner Cairngorm.
As a result, in 1910 Running Water had to be sent to American Herman Duryea's Haras du Gazon stud farm in Bazoches-au-Houlme in France so she could be bred.
Running Water's French-born offspring included Boyne, Breakwater, Mayflower, Pierre Qui Roule, Rappahannock, Reprise, Rochebelle, and Runlad.