The aquatics events at the 2009 Southeast Asian Games included swimming, diving and water polo.

The events were held at the Aquatic Center, Swimming Pool, National Sports Complex, Laos.

The diving events at the 2009 Southeast Asian Games took place at the Swimming Pool, National Sports Complex.

The Diving events were held from 11 December to 14 December, with 8 gold medals up for contention.

Four teams were in competition in a round-robin format, with defending champion Singapore retaining its title which it has won 23 times consecutively since Singapore gained independence in 1965, inclusive of the current games.