Martin Christian Grau (born 26 March 1992) is a German track and field athlete who specialises in the 3000 metres steeplechase.

[1] His international debut came at the age of eighteen, when he finished eleventh at the 2010 World Junior Championships in Athletics.

[5] After setting a personal best of 8:24.29 minutes in June 2014, he established himself as a senior athlete with a second-place finish behind France's Yoann Kowal at the 2014 European Team Championships Super League.

[3] At the 2014 German Athletics Championships he claimed the runner-up spot behind the more established Steffen Uliczka.

[3] The 2015 Universiade was the venue of his first international steeplechase title, where he beat all-comers in the student event with a run of 8:31.55 minutes.