The 2021 FIVB Volleyball Girls' U18 World Championship was the 17th edition of the FIVB Volleyball Girls' U18 World Championship, contested by the women's national teams under the age of 18 of the members of the Fédération Internationale de Volleyball (FIVB), the sport's global governing body.

[1] United States were the defending champions, but lost in the semifinals to Italy.

However, due to the ongoing global COVID-19 pandemic and subsequent impact on some Confederations’ ability to organise the events within the given deadline, the FIVB has decided to postpone the deadline for continental qualifications to 28 February 2021.

[2][3][4][5] * Japan, China, and South Korea withdrew from the competition.

Bulgaria, Egypt and Slovakia entered by the world ranking.