The 1964 season was the 45th season of the Primera División de Costa Rica , the highest Costa Rican soccer league. Nine teams took part. Saprissa won the championship for the fifth time in the club's history.
Competition mode
The nine participating teams played the championship in a double round (home and away games) in the mode everyone against everyone .
There was no relegation, as the Primera División was increased by one team every year for the 1965 season.