The 2020 IIHF U18 Women's World Championship Division I was two international under-18 women's ice hockey tournaments organized by the International Ice Hockey Federation (IIHF). Divisions I A and I B represent the second and the third tier of competition at the 2020 IIHF World Women's U18 Championship.
The Division I Group A tournament was played in Füssen, Germany, from 3 to 9 January 2020.
The Division I Group B tournament was played in Katowice, Poland, from 2 to 8 January 2020.