Åtvidabergs Fotbollförening, also known simply as Åtvidabergs FF, Åtvidaberg, Åtvid or (especially locally) ÅFF, is a Swedish professional football club based in Åtvidaberg. The club is affiliated with Östergötlands Fotbollförbund and plays their home games at Kopparvallen. The club colours, reflected in their crest and kit, are blue and white. Formed on 1 July 1907 as Åtvidabergs IF, the club was most successful during the 1970s when they won two national championship titles and two national cup titles. With a population of around 7000, Åtvidaberg is the smallest town ever to bring home a Swedish league title. They currently play in Superettan, where the season lasts from April to November.