Founded in 1929, CB L'Hospitalet is one of the oldest basketball clubs in Spain.

In 1974, CB L'Hospitalet achieved their first promotion ever to the National League, where it played until 1978.

After several relegations, L'Hospitalet comes back to Liga EBA, third tier in that time, in 1999 and it becomes champion in the 2003–04 season, thus promoting to LEB 2, the new third division later renamed as LEB Plata.

In 2010, L'Hospitalet could not register in LEB Plata due to the inability to meet the financial requirements and was dropped to the fifth tier, but came back to Liga EBA by achieving a vacant berth in the Group C. In the 2015–16 season, L'Hospitalet registered a 30–2 record for promoting to LEB Plata, six years after the last time they played.

However, it remained in the league due to the existence of vacant places in it.