Per Fosser (born 1945) is a Norwegian orienteering competitor. He is Relay World Champion from 1970, as a member of the Norwegian winning team, which consisted of Ola Skarholt, Stig Berge, Fosser and ÃÂ ge Hadler. He won a bronze medal in the relay at the 1968 World Championships, again with Skarholt, Berge and Hadler on the team.
Fosser is grandfather of Kasper Fosser.