The 2021 FIFA Beach Soccer World Cup was the 11th edition of the FIFA Beach Soccer World Cup. Overall, this was the 21st edition of a world cup in beach soccer since the establishment of the Beach Soccer World Championships which ran from 1995 to 2004 but was not governed by FIFA. This was the sixth tournament to take place biennially; the World Cup took place annually until 2009. The tournament took place in Moscow, capital of Russia, between 19 and 29 August 2021.

The FIFA Beach Soccer World Cup is an international beach soccer competition contested by the national teams of the member associations of FIFA, the sport's global governing body. The tournament was preceded by the Beach Soccer World Championships established in 1995 which took place every year for the next decade under the supervision of Beach Soccer Worldwide (BSWW) and its predecessors. FIFA joined hands with BSWW in 2005 to take over the organization of the competition, re-branding it as an official FIFA tournament.