The Men's marathon at the 2004 Summer Olympics took place on August 29 in the streets of Athens, Greece where one hundred and one athletes from 59 nations competed. The event was won by Stefano Baldini of Italy, the nation's first victory in the event since 1988 and second overall. The United States reached the podium in the event for the first time since 1976 with Meb Keflezighi's silver. Vanderlei de Lima took bronze, Brazil's first-ever medal in the men's marathon.

Vanderlei Cordeiro de Lima is a Brazilian retired long-distance runner. He was born in Cruzeiro do Oeste, Paraná. While leading the marathon after 35 km at the 2004 Summer Olympics, he was attacked on the course by Irish former priest Cornelius "Neil" Horan. Following the incident, de Lima fell from first to third place, eventually winning the bronze medal. He was later awarded the Pierre de Coubertin medal for his sportsmanship shown in that race.