The 1948 season was the 28th season of the Primera División de Costa Rica , the highest Costa Rican soccer league. Seven teams took part. Heredia won the championship for the 12th time in the club's history.
The seven participating teams played out the playoff and playdown participants in a single round (only one game) in the mode everyone against everyone .
The four playoff participants each played against each other once, the points scored were added to the points from the main round.
The last two teams played out the relegation participants.
The relegation participant played a relegation game against the champions of the 2nd division.
CD Saprissa was accepted despite the relegation defeat due to the sovereign championship win in the 2nd division and the good relegation games in the 1 a División.
Cup competitions
Copa Gran Bretaña 1948
The pre-season Copa Gran Bretaña 1948 was won by Alajuela.
Torneo Relámpago 1948
The Torneo Relámpago , in which the first division teams took part and a game lasted only 30 minutes, Orión won 1-0 in the final against the UCR.