Marc Jenkins (born 21 July 1976) is a Welsh triathlete from Bridgend.
Jenkins competed at the second Olympic triathlon at the 2004 Summer Olympics. He was the last man to finish, because of a collision during the cycling leg that left his bicycle unusable. Rather than quit, he ran the two remaining kilometers with the bike on his shoulders to place forty-fifth of the fifty who started. His time was 2:05:33.60.
Jenkins married fellow Olympic triathlete, Helen Tucker, in October 2008.