Jacob Kiplimo (born 14 November 2000) is a Ugandan long-distance runner who is the current world record holder in the half marathon. At the 2020 Tokyo Olympic and the 2022 World Athletics Championships, Kiplimo won a bronze medal in the 10,000 m. Kiplimo also won gold medals in the 5000 m and 10,000 m at the 2022 Commonwealth Games, and he won a silver and gold medal at the 2019 and 2023 World Cross Country Championships, respectively. Kiplimo won the 2020 World Half Marathon.

At age 15, he represented his country at the 2016 Rio Olympics, becoming the youngest ever Olympian for Uganda. He was the 2017 World Cross Country junior champion. Kiplimo is also the Ugandan record holder for the 3000 metres.

Kiplimo was born on 14 November 2000. A member of the Sebei ethnic group, he grew up in Kween on Mount Elgon, living at a high altitude. His family grew maize. As a young child, Kiplimo would watch his older brothers train for athletic events. He would also travel to school by running a distance of 5 km. Kiplimo won a selection trial for the World Mountain Running Championships in 2015 but was not allowed to compete due to his age. Kiplimo then moved to Italy and began competing in events. After winning a 2017 cross country event in Uganda, he moved back.

At the age of fifteen, Kiplimo won the 10,000 metres bronze medal at the 2016 IAAF World U20 Championships behind fellow East Africans Rodgers Kwemoi and Aron Kifle. He ran 5000 metres in Rome that May at 13:24:40 minutes, which was a qualifying time for the Olympics. Kiplimo was then selected for 2016 Summer Olympics. Before the 2016 Rio Olympics, he improved his 5000 m best to 13:19.54 minutes. As the youngest entrant to the competition, he ran in the Olympic heats only, recording a time of 13:30.40 minutes for 11th in his race. He was the youngest ever competitor for Uganda at the Olympic Games.

At 16, Kiplimo won gold in the men's U20 race at the 2017 World Cross Country Championships in Kampala, the country's first-ever gold medal at a World Cross, covering a 8 km course in 22:40 minutes. He won the San Silvestre Vallecana 10 km road race in Madrid in a time of 26:41 on 31 December 2018. The course had an elevation drop, making it ineligible for world record status.

At the Ugandan Cross Country Championships on 16 February in Tororo, Kiplimo defeated Joshua Cheptegei by placing first and second, respectively. In the men's senior race over 10 km, Kiplimo won by an 11-second lead over the 10,000 m world championship runner-up.

At the World Cross Country Championships in Aarhus, Denmark, Kiplimo finished second in the senior men's race four seconds after Joshua Cheptegei's winning time of 31:40. He won the gold medal in the teams ranking with Cheptegei from Uganda.

Kiplimo did not run in the 10,000 metres at the World Athletics Championships in Doha because of an injury.