Mjällby Allmänna Idrottsförening, also known simply as Mjällby AIF, is a Swedish professional football club based in Hällevik. The club is affiliated to Blekinge Fotbollförbund and play its home games at Strandvallen. The club colours, reflected in their crest and kit, are yellow and black. Formed on 1 April 1939, the club have played seven seasons in Sweden's highest football league Allsvenskan, the club's first season in the league was in 1980. The club are currently playing in Allsvenskan, where the season lasts from April to October.