에이오 에걸레오 1931 PAE

Egaleo was founded in 1931 by Demetrios Haniotis and Georgios Aronis, as Athletic Union of Ierapolis (Αθλητική Ένωση Ιεραπόλεως – Athlitiki Enosis Ieropoleos). In 1946, three other clubs in the district merged with A.E. Ierapoleos to form Athletic Club Egaleo (Αθλητικός Όμιλος Αιγάλεω – Athlitikos Omilos Egaleo), which managed to reach for the first time the first division in 1961.

In the 2003–04 season, Egaleo managed its second better ever classification, fifth (fourth in the 1970–71 season), playing UEFA Cup for the first time in 2004–05, appearing in the group stages (after defeating Gençlerbirliği of Turkey 2–1 score on aggregate) with FK Partizan, S.S. Lazio, Middlesbrough and Villarreal CF, which ended with the conquest of just one point. In the league, the club finished sixth, trailing PAOK by just one point.

After a disappointing 2006–07, Egaleo was relegated back to the second level. Another relegation followed in the next year, and a third in 2008–09.

In August 2009, a merger between Egaleo and Ilisiakos F.C. took place, as the other club participated in the second division, with the purchase being made effective by Egaleo's owner Thomas Mitropoulos; the new club, which took Ilisiakos' place, was renamed Egaleo A.O.

At the end of the 2009–10 season, due to the merger being declared illegal by the Greek Council of State, Egaleo FC was relegated to the Delta Ethniki.