Reykjanesbær is a municipality on the Southern Peninsula (Suðurnes) in Iceland. It is made up of the towns Keflavík, Njarðvík and the village of Hafnir. The municipality was created in 1994 when the inhabitants of the three towns voted to merge them into one. Reykjanesbær is the fifth largest municipality in Iceland, with 18.920 citizens (2019).