Most nations in a FINA World Championships
- Who
- 15th FINA World Championships
- Where
- Spain (Barcelona,)
- When
- 19 July 2013
The most nations to participate in a FINA World Championships is 181 and took place at the 15th FINA World Championships held in Barcelona, Spain, from 19 July to 4 August 2013.
The FINA World Championships are a biennial event that cover a range of aquatics disciplines including swimming, diving and water polo. In 2011 the championships were held in Shanghai with 178 countries participating.