Martin Kiptolo Lel is a Kenyan professional long distance and marathon runner. He won the London Marathon in 2005, 2007, and 2008, the New York City Marathon in 2003 and 2007 and the Great North Run in 2007 and 2009. His personal best time, as of April 2008, is 2:05:15, which he ran in the 2008 London Marathon setting a course record. Lel is coached by Claudio Berardelli and lives in the Rift Valley region of Kenya.

The London Marathon is an annual marathon held in London, England. It is the largest marathon in the world, with over 53,700 finishers in 2024, and 840,318 applicants for the 2025 event. Founded by athletes Chris Brasher and John Disley in 1981, it is typically held in April, although it moved to October for 2020, 2021, and 2022 due to the COVID-19 pandemic. The largely flat course is set around the River Thames, starting in Blackheath and finishing at The Mall. Hugh Brasher is the current race director and Nick Bitel its chief executive.