The 1977–78 St. Louis Blues season was the 11th for the franchise in St. Louis, Missouri. Prior to the season, the team's founders, Sid Salomon, Jr. and Sid Salomon III, sold the team to pet food giant Ralston Purina, and the St. Louis Arena became the Checkerdome. The Blues finished the season with a record of 20 wins, 47 losses and 13 ties for 53 points, and finished out of the playoffs for only the second time in team history.