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 Íþróttafélag 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.