AC Omonia participant of 1953–54 Cypriot First Division
Athletic Club Omonia Nicosia (Greek: Αθλητικός Σύλλογος Oμόνοιας Λευκωσίας; Athlitikos Sillogos Omonias Lefkosias), commonly known as Omonia Nicosia, or simply Omonia (also transliterated as Omonoia), is a Cypriot professional multi-sport club, established on 4 June 1948 in Nicosia. It is best known for its football department, which has played in the Cypriot First Division since 1953. On 14 June 2018, the football department of AC Omonia became a professional for-profit football company, and is since known as Omonia FC.Omonia is one of Cyprus' most successful football clubs, having won 21 National Championships, 16 Cups, and a record 17 Super Cups. Omonia has won five doubles and a record three domestic trebles, and is one of three Cypriot clubs to never have been relegated to the second division. Omonia also holds an outstanding record of 14 championships in two decades (between 1970 and 1989), a record of being either champion or runner-up 14 times in a row in the championship (between 1973 and 1986), and the record of having won the Cypriot Cup four times in a row (between 1980 and 1983).
AC Omonia also operates departments in basketball, volleyball, futsal, cycling, runners, women's football and women's volleyball.