Marius Kimutai (born 10 December 1992) is a Kenyan-born Bahraini long-distance runner.

In 2019, he won the Hangzhou International Marathon in Hangzhou, China with a time of 2:10:05 which was also a new course record.

[2] In 2023 Marius Kimutai won the Barcelona Marathon with 02:05:06 On 10 April 2024, Marius Kimutai returned a signed Admission of Anti-Doping Rule Violations and Acceptance of Consequences form, confirming that he admitted to the anti-doping rule violations and accepted the claimed period of ineligibility.

On 15 April, Marius Kimutai was suspended for three years for doping.

This biographical article relating to Bahraini athletics is a stub.