The 2014–15 A1 Ethniki is the 84th season of the Greek premier Water polo league and the 29th of A1 Ethniki. The winner of the league was Olympiacos, which beat Panathinaikos in the league's playoff's finals. It was the first final of the eternal enemies in Water Polo Championship. The clubs Panionios and Nireas Lamias (withdrawnshortly before the end of the championship) were relegated to the Greek A2 League.