Sabastian Kimaru Sawe (born 16 March 1996) is a Kenyan long-distance runner. He finished seventh in the senior men's race at the 2023 World Cross Country Championships.

In September 2022, Sawe set a Kenyan national record in the one hour run at the Memorial Van Damme with a distance of 21,250 metres, narrowly missing the world record.

In March 2022, he set a course record at the Rome-Ostia Half Marathon in a time of 58:02 (a non-record eligible course). He set a then half marathon best of 58:58 from his win at the 2022 Bahrain Royal Night Half Marathon. In December 2023, he won the 15 kilometres road race Montferland Run held in 's-Heerenberg with a time of 42:35. In September 2024, he won the Copenhagen Half Marathon in a new personal best of 58:05.

On 1 December 2024, he won the Valencia Marathon in a world-leading time of 2:02:05. On 27 April 2025 he won the London Marathon in a leading time of 2:02:27.

On 21 September 2025 he won the Berlin Marathon in 2:02:16.