The men's 100 kilometres was one of seven track cycling events on the Cycling at the 1908 Summer Olympics programme. Its distance was the longest of the individual event distances. A challenge cup was presented by the Prince of Wales to the winner. There were 43 competitors from 11 nations. Each nation could enter up to 12 cyclists. The event was won by Charles Henry Bartlett of Great Britain, with his countryman Charles Denny finishing second. Octave Lapize earned bronze, making France the only nation to have medalists at both appearances of the 100 kilometres race (Léon Flameng won in 1896).