| Clubname: | Fjölnir |
| Fullname: | Ungmennafélagið Fjölnir |
| Ground: | Fjölnisvöllur, Reykjavík |
| Capacity: | 1,030 (700 seated) |
| Chairman: | Jón Karl Ólafsson |
| Manager: | Ásmundur Arnarsson |
| League: | 1. deild karla |
| Season: | 2023 |
| Position: | 1. deild karla, 3rd of 12 |
| Website: | http://www.fjolnir.is |
| Current: | 2016 Ungmennafélagið Fjölnir season |
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Ungmennafélagið Fjölnir, commonly known as Fjölnir, is a multi-sport club from Iceland. The club is located in Grafarvogur, Reykjavík. The club was founded in 1988 under the original name ; however, because another team already had the abbreviation UMFG, the name was changed to, commonly referred to as . A total of nine sports are practised at the club: football, basketball, handball, taekwondo, karate, tennis, swimming, athletics and gymnastics. Chess is also played at the club. Each one of these sports has their own department with their own board but all are under the main board and the club office.
, Fjölnir women's football competes in 2. deild kvenna, the third tier of women's football in Iceland.[1]
See main article: Fjölnir men's basketball.
See main article: Fjölnir women's basketball.
On 28 September 2018, Skautafélagið Björninn folded with Fjölnir overtaking all its departments, assets and debts.[3] On 2 March 2024, Fjölnir women's team won its first national championship after beating SA Ásynjur, three games to one, in the championship finals.[4] [5]