Athletic Club Omonoia Nicosia (Greek: Αθλητικός Σύλλογος Ομόνοια Λευκωσίας) is a professional football club that plays in the Cyprus capital city Nicosia.
The club was established in 1948 and became a member of the Cyprus Football Association in 1953. Omonoia, which means 'Concord' in Greek, has won 20 League Championships, 13 Cypriot Cups and 15 Super Cups and 5 domestic doubles – in 1972, 1974, 1981, 1982 and 1983 all since 1948.
Omonoia's history speaks for herself. Since joining the Cypriot First Division, Omonoia has won nearly 1 out of every 3 league titles, qualifying it as the most successful club in Cypriot history. Prior to the 1953 season, no more than 8 teams participated in the Cypriot First Division, and half of which no longer exist. (APOEL Nicosia has won 21 titles. However half of them were won between the years 1935 and 1953, prior to the formation of AC Omonoia when Omonoia AC players still played for APOEL Nicosia).
The Cyprus Football Association declared them as the Team of the 20th Century. Omonoia remains the only team to have won the Cypriot Cup 4 times in a row, between the years 1980 and 1983. As an athletic club, Omonoia also has basketball, volleyball, futsal and cycling sections.