The Fjölnir men's basketball, commonly known as Fjölnir, is the men's basketball department of Ungmennafélagið Fjölnir multi-sport club.
It is based in Grafarvogur, Reykjavík.
As of the 2019-2020 season it plays in the Úrvalsdeild karla.
Note: Flags indicate national team eligibility at FIBA-sanctioned events.
Players may hold other non-FIBA nationalities not displayed.