The Nevada Interscholastic Activities Association (NIAA) is the governing body of athletic programs for high schools in the U.S. state of Nevada. In addition, five schools in the state of California (Coleville, Needles, North Tahoe, South Tahoe, and Truckee) and one from Arizona (Beaver Dam) are also members as the schools are geographically isolated from other in-state schools.

It is a non-profit organization founded in 1922 as the Nevada Interscholastic League and became affiliated with the National Federation of State High School Associations in 1939. The league changed its name to the current form in 1967. The NIAA governs eligibility of student athletes, resolves disputes, organizes levels of competition by divisional separation of schools according to attendance population, and conducts state championship competitions in all the NIAA-sanctioned sports.

The NIAA sponsors 24 sports, 13 for boys and 11 for girls. The seasons are broken down into three seasons (Fall, Winter, and Spring). The 24 sports are:

1 Only schools in Southern Nevada compete in this sport.
2 Only schools in Northern Nevada compete in this sport.
5 Girls may participate in the boys only sanctioned sports (football and wrestling), as there is no corresponding sport for them. However, they will play against males athletes if they do so.

This list includes state championship results for recent seasons for schools competing in the highest division existing in that year.

Boys

Girls

Boys