The Women's World Chess Championship 2018 was a knock-out tournament to crown a new women's world champion in chess. It was the second world championship held in 2018, after Ju Wenjun had defeated Tan Zhongyi to win the title in May 2018. The tournament was played as a 64-player knockout type from 2 to 23 November in Khanty-Mansiysk, Russia.

The 2018 Women's World Chess Championship Match was a match held between Tan Zhongyi, the 2017 Women's World Chess champion, and her challenger Ju Wenjun to determine the new women's world chess champion. Ju Wenjun qualified by winning the FIDE Women's Grand Prix 2015–16.