The Mumbai Marathon (known as the Tata Mumbai Marathon for sponsorship reasons by Tata Group), is an annual international marathon held in Mumbai, India, on the third Sunday of January every year. It is the largest marathon in Asia as well as the largest mass participation sporting event on the continent. It is the richest race in India with a prize pool of US$405,000.

The Mumbai Marathon has six different race categories: Marathon (42.195 km), Half Marathon (21.097 km), Dream Run (6 km), Senior Citizens' Run (4.3 m), Champions with Disability (2.4 km), and a Timed 10K.

The course records set in 2013 were the fastest times ever run for a marathon in India in the women's marathon category – 2:24:33 by the women's winner Valentine Kipketer, Kenya. In 2020, Derara Hurisa broke the men's marathon record, completing the race in 2:08:15.

The event helped bridge the gap between Indian elite athletes and the international elite. Mumbai Marathon provides Indian runners with a platform to compete with the best in the world. The dream of qualifying for the London Olympics became a reality for Ram Singh Yadav, who clocked his best marathon time of 2:16:59 at the 2012 edition.