Olivier Marceau (born 30 January 1973 in Fontenay-aux-Roses, Hauts-de-Seine) is an athlete from France, who competes in triathlon.

A member of the Poissy Triathlon Club he competed at the first Olympic triathlon at the 2000 Summer Olympics.

He took seventh place with a total time of 1:49:18.03.

Four years later, at the 2004 Summer Olympics, Marceau competed again.

This biographical article related to a Swiss athlete known for competing in triathlons is a stub.