The 1969–70 Porin Ässät season was the club's third season in the SM-sarja, the top-tier ice hockey league in Finland. Ässät finished 6th in the league.
Ässät's season started on the 1st of November in a game against IFK Helsingfors, which ended in Ässät's 1–2 loss. Ässät's biggest victory came against Reipas, when Ässät beat them 12–2 at home ice. Ässät won nine games and tied five times in the 22 game season, which gave them the 6th spot with 23 points.[1] Ässät's top point scorer was Jaakko Honkanen with 20 points. The top goal scorer was defenceman Ilkka Mesikämmen with 13.[2] Ässät's captain was Raimo Kilpiö and the team was coached by Lasse Heikkilä.[3]