The Idaho High School Activities Association (IHSAA) oversees high school athletics and activities in the state of Idaho.

Idaho high schools are classified in six categories, based on enrollment, for league competition and state playoffs and championships.

The IHSAA recognizes twenty specific sports and activities.

[2] IHSAA classifications are based on four-year enrollments (grades 9–12).

Snake River Conference - (south central) White Pine League (Div I) - (north central) Western Idaho Conference - (southwest)