1. deild karla (English: Men's First Division) or D1 is the second-tier basketball competition among clubs in Iceland.

The top team from the regular-season phase and the four-team playoff round winner are promoted to the Úrvalsdeild karla.

The bottom club is relegated, and replaced by the four-team playoff round winner of the third-tier 2. deild karla.

[4] His scoring prowess helped Ármann win the league and achieve promotion to the Úrvalsdeild karla.

[2] Even though Shouse played in the nation's tier 2 league during his first season, he was widely regarded as one of the best players in the country.