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Foundation

Ionikos was established in 1965, from a merger of local clubs Nikaia Sports Union and Aris Piraeus, with Alex Meraklidis as new club's first president. The club's early years were not easy, but, with the support of its fans, Ionikos slowly improved through the 1970s and 1980s and eventually reached the top division in 1989.

The club's first promotion to the top flight was accompanied by unexpected problems—Dimitris Melissanidis withdrew as chairman, and the club needed 50 million drachmas to participate in the championship. Businessman Nikolaos Kanellakis stepped forward to provide the needed sum and become the club's new chairman.

Nikos Kanellakis

Kanellakis' arrival would be the beginning of the club's greatest era—from the 1989 promotion, Ionikos would spend 16 of the next 18 seasons in the Greek top flight, up until 2007, and during that time the team would finish as high as 5th-place in the league (on two occasions), reach a Greek Cup Final, and compete in the UEFA Europa League.

Greek Cup Final 2000

Ionikos' UEFA Cup appearance came in the 1999–00 season—the opposition was French side Nantes, and Ionikos lost both home and away matches, 1–3 and 0–1, respectively. Ionikos reached the Greek Cup Final later that same season, where they came up against traditional power AEK, and, despite a valiant Ionikos effort, AEK won the match, 3–0.

On 21 April 2004 Ionikos experienced the most tragic moment of his history, when Nikolaos Kanellakis, the club's chairman for 14 years, died. Hundreds of Ionikos supporters—as well as other sports fans—attended Kanellakis' funeral, where the flag of Ionikos covered the coffin of the late chairman. Nikolaos' son Christos took his father's place as chairman.

Relegation to Second League

Ionikos' long run in the top flight ended in the 2006–07 season, when the team finished in 16th-place in the Super League and was relegated back to Beta Ethniki. Ionikos has spent the last two seasons in Beta Ethniki, finishing 5th and 4th place, respectively, as the club tries to rejoin the top flight.

Return to the Top League

For the upcoming season, 2021–22, they will compete once again in the Greek top league, 2021–22 Super League Greece, having gained promotion, and after successfully getting licensed to compete in the top league's new season.