The FIBA 3x3 U18 World Cup is an 3x3 under-18 basketball tournament run by the International Basketball Federation (FIBA) since 2011.

The tournament was known as the FIBA 3x3 U18 World Championships until the 2016 edition.

The event was held for the first time in Rimini, Italy, in September 2011 and has been held annually since then.

The tournament was not held in 2014 and 2018 due to 3x3 basketball being an event at the 2014 Summer Youth Olympics and 2018 Summer Youth Olympics.

[1][2] In 2020, it was not held due to COVID-19 pandemic.