Marco Marchei (born 2 August 1954 in Castignano, Ascoli Piceno) is a retired male long-distance runner from Italy.

He twice competed for his native country at the Summer Olympics: in 1980 and 1984.

Marchei set his personal best (2:11.47) in the men's marathon on 14 August 1983 at the World Championships.

He is the father of Valentina Marchei.