The swimming competitions at the 2023 SEA Games took place at Morodok Techo National Aquatics Center in Phnom Penh from 6 to 11 May 2023.

The 800m/1500m freestyle for men and women was removed respectively, and was replaced with the introduction of the mixed 4X100m medley relay for the first time in SEA Games history.

Singapore once again cemented their swimming dominance in Southeast Asia by a wide margin.

Winning 47 medals, consisting of 22 gold, 16 silver and 9 bronze across the competition, the country achieved their best ever away results.

One of their swimmers, Jonathan Tan, also achieved Olympic qualification timing for the 2024 Summer Olympics in Paris – while at the same time breaking the Southeast Asian Games record and national record.