Great Britain competed at the 2025 World Aquatics Championships in Singapore from July 11 to August 3, 2025.
20 athletes were named to the World Championships roster.
On April 24th, 2025, 28 athletes were named to the World Championships team. In qualification for the 200 metre freestyle event Duncan Scott and James Guy tied for the final qualification place. In the end James Guy was chosen to represent Great Britain in the event.