Nikki Kimball (May 21, 1971 - ) is an American distance runner specializing in the Ultramarathon. She ran her first 100-mile race at the Western States 100 Mile Endurance Run in 2004, and was the female winner. She was the winning female at Western States again in 2005 and 2007, becoming only the third woman to win Western States three times. Prior to running, her main sport was cross-country skiing. She was crewed at the 2007 Western States by U.S. Senator Max Baucus of Montana, where Kimball lives. She lives in Bozeman, Montana.