 Among its achievements was a fourth-place finish in the 1945–46 season, and the title of Portuguese Champion in the 1923–24 Campeonato de Portugal, at the time the most important national competition.In 1951, after ten consecutive seasons, the club returned to the second division.Having been out of the top division since 1975, and after the relegation of neighbouring S.C. Farense to the lower leagues (including regional levels), Olhanense became once again the region's most important team, competing for the honour with Portimonense S.C.