Knattspyrnufélag Fjarðabyggðar (Icelandic pronunciation: [ˈkʰnahtˌspɪ(r)tnʏˌfjɛːˌlaːɣ ˈfjarðaˌpɪɣðar], lit.

'Fjarðabyggð Football Club'), abbreviated as KFF, was an Icelandic football club from the town of Fjarðabyggð located on the east coast of Iceland.

The club was founded in 2001 with a merger of three local clubs, Íþróttafélagið Þróttur Neskaupstað, Ungmennafélagið Austri Eskifirði and Ungmennafélagið Valur Reyðarfirði.

The next year, for the first time, Fjarðabyggð sent a women's team to play at league level.

In 2022, the club merged with Leiknir Fáskrúðsfjörður to establish the new Knattspyrnufélag Austfjarða.