Athlitikos omilos Kastellas (English: Kastellas athletic club) is a water polo club based in Kastella, Piraeus, Greece. The club was established in 1977 and also has football and swimming teams.
Since establishment is hard working especially as a Water polo Academy and growing up water polo players who make great carriers in Big Greek water polo Clubs and National Team. As of the 2022-23 competes in the Greek Water Polo Championship C (men) and B (women) and in Youth & Junior Championships.
Kastellas made its debut on TOMO Tournament in 2019, best result is 19th place from same year. In this years tournament it will compete in U14 category.