Aquatics at the 2005 East Asian Games in Macau, included competition in 3 disciplines:
Prelims began at 9:00 a.m.; Finals at 7:00 p.m. These Games marked the first time the 50s of stroke (50 back, 50 breast, 50 fly) were sum at the Games; consequently, new Games Records (GR) were established in each of these events.