Croydon Kings is an Australian semi-professional soccer club in Adelaide, South Australia. Croydon Kings currently competes in the National Premier Leagues South Australia. They play home games at Polonia Reserve at Croydon in Adelaide's inner northern suburbs. They are one of the most successful sides in South Australian soccer. The club's ethnic background is Polish Australian and the club was founded as the Polonia Adelaide Sports Club on 16 June 1950 by Alek Cmielewski and Karol Metanomski.