First Division or D1 (Icelandic: 1. deild karla) is the second tier basketball competition among clubs in Iceland. It is organized by the Icelandic Basketball Federation (Icelandic: Körfuknattleikssamband Íslands – KKÍ).The season consists of a home-and-away schedule of 18 games followed by a four-team playoff round. Both semifinals and finals series are best-of-three.