Dennis Kipruto Kimetto (born 22 January 1984) is a Kenyan long distance runner who competes in road running events. He was the world record holder in the men's marathon with a time of 2 hours 2 minutes 57 seconds, a record which he held until Eliud Kipchoge broke it in 2018 with a time of 2:01:39.
Hailing from Eldoret and part of a training group including Geoffrey Mutai, Kimetto's first major win came in the half marathon section of the Nairobi Marathon in 2011. Running as Dennis Koech, he topped the podium in a time of 1:01:30. He quickly rose into the global running elite in his first outings outside of Kenya. At the RAK Half Marathon he defeated a field including Wilson Kipsang Kiprotich to win the race in 60:40 minutes. His age was misreported as ten years younger, and his following run of 59:14 minutes to win the Berlin Half Marathon in April was briefly considered a world junior best. An erroneous passport was the cause of both the age difference and the Koech misnomer, his surname actually being Kimetto. This was rectified in later competitions.