Njarðvík FC (Icelandic pronunciation: [ˈnjarðˌviːk]), commonly known as Njarðvík or UMFN, is the men's football department of Ungmennafélag Njarðvíkur multi-sport club, based in the town of Reykjanesbær in Iceland.

It currently plays in the Icelandic football league system second-tier 1. deild karla.

Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.

Players may hold more than one non-FIFA nationality.

Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.