The 1975 Portland Timbers season was the inaugural season for the Portland Timbers, an expansion team in the now-defunct North American Soccer League. In the Timbers first year of existence, the club won the Western Division title while amassing more points than any other club in the league. In the playoffs, the Timbers needed overtime to get past the Seattle Sounders and then defeated the St. Louis Stars en route to a berth in Soccer Bowl '75. Portland lost the championship game 2–0 to fellow expansion side Tampa Bay Rowdies at Spartan Stadium in San Jose, California on August 24.