Peter Marsh was a skilled right-winger who played a solid third line role during his five NHL seasons. He was an explosive scorer in junior and the WHA but accepted a more versatile role to prolong his career.
Born in Halifax, Nova Scotia, Marsh was chosen 29th overall by the Pittsburgh Penguins after scoring 75 goals for the QMJHL's Sherbrooke Castors in 1975-76. That year, he also represented Canada at the World Junior Championships and was named to the tournament all-star team as well as the QMJHL west division first all-star team.
Rather than join Pittsburgh, Marsh accepted an offer from the Cincinnati Stingers of the WHA. He was a key offensive performer for the club and notched a personal best 43 goals in 1978-79. On June 13, 1979 the Winnipeg Jets in the Expansion Draft that was part of the NHL/WHA merger claimed him.
Marsh scored 18 goals for the Jets in 1979-80 but struggled defensively with a -38 plus/minus rating. Two months into the next season, he was traded to the Chicago Black Hawks where he often formed a reliable unit with Bill Gardner and Reg Kerr. Marsh was a solid worker on the Hawks when they reached the semi-finals in 1981-82 then amassed 104 points and reached the semi-finals again the following season. The veteran forward retired after splitting the 1983-84 season between the Hawks and the AHL's Springfield Indians.