Keegan Swenson (born February 16, 1994) is an American mountain bike and gravel racing cyclist, riding for the Specialized Off-Road Team, and is the current Marathon Mountain Biking World Champion. He has won the Leadville Trail 100 MTB for 5 consecutive years (2021-2025), and holds the course record of 5:43:31, which he set in 2023. He also won the first three editions of the Life Time Grand Prix overall race series.