Marios Athanasiadis (born 31 October 1986, Nicosia) is a Cypriot cross-country mountain biker. At the 2012 Summer Olympics, he competed in the Men's cross-country at Hadleigh Farm, finishing in 40th place, the last rider to finish without being lapped. At the 2014 Commonwealth Games he finished in 16th place in the men's cross-country.