The Under-18 Series is a three-game series vs. Canada that features the U.S. Under-18 Women's Select Team. Twenty-five players are chosen to represent the U.S. following participation in the USA Hockey Women's National Festival.

The Series has been held annually since 2007. The 2024 series will be played Aug. 14, 15 and 17 in St. Catharines, Ontario. 

Following the 2023 series, the U.S. and Canada have met 14 times at the Under-18 Series and Team USA holds a 14-3-5-23 (W-OTW-OTL-L) record.