The Oregon School Activities Association (OSAA) is a non-profit, board-governed organization that regulates high school athletics and competitive activities via athletic conferences in the U.S. state of Oregon, providing equitable competition among its members, both public and private.

Currently, the OSAA sponsors seventy-four state championships in nineteen interscholastic activities including athletics, music, and forensics and is a member of the National Federation of State High School Associations.

This caused some controversy as some school districts complained about the new classifications and sought legal action.

As of the 2022-23 season, OSAA's classifications comprise the following:[8] Schools often compete in different divisions for football; in other sports, conferences are constructed to aim to preserve historic rivalries, regardless of current enrollment.

As of the 2022-23 season, OSAA's classifications comprise the following:[9] No League Yet 4A Southern Oregon Conference : The final year of the Southern Oregon Conference consisted of South Medford, North Medford, Klamath Union, Eagle Point, Ashland, Crater, Grants Pass and Roseburg.