The USATF Masters Indoor Championships is an annual track and field competition which serves as the national indoor championship for the United States for athletes in masters age groups. Organized by USA Track & Field, the national governing body for the sport, the competition was first held in 1975. Athletes compete in 5-year age groups, beginning from 25 and up to 105 (where sufficient entries are made). Traditionally limited to athletes over 35, a "pre-masters" group was introduced from 2020 onwards to encourage post-collegiate athletes over 25 to continue competing.