Körfuknattleiksfélag Selfoss, commonly known as Selfoss-Basket (Icelandic: Selfoss-Karfa), is a basketball club in Selfoss, Iceland. Its men's team currently plays in the 1. deild karla.
The club was founded on August 24, 2005 as ÃÂþróttafélag FSu (English: FSu Sports Club). In 2012 it changed its name to Körfuknattleiksfélag FSu (English: FSu Basket) and on April 5, 2018, the club changed its name again to Körfuknattleiksfélag Selfoss (English: Selfoss Basketball Club), or Selfoss-Karfa (English: Selfoss-Basket) for short.
In 2008, FSu gained promotion to the ÃÂrvalsdeild karla after beating Valur in the 1. deild karla promotion playoffs. It played in the ÃÂrvalsdeild until 2010, when it was relegated back to 1. deild. In 2015, FSu beat Hamar in the promotion playoffs and gained promotion to the ÃÂrvalsdeild karla for the second time in its history. During the 2015âÂÂ16 ÃÂrvalsdeild karla season they posted a 3-19 record, finishing second-to-last in the league and were relegated back to 1. deild. In February 2021, the team made an affiliation deal with Real Betis.
The club fielded a joint women's team with neighbouring club Hrunamenn in the second-tier 1. deild kvenna, under the name FSu/Hrunamenn, from 2013 to 2015.