OAU stands for the Organization of African Unity.

OAU could also refer to:

Obafemi Awolowo University, a university located in Ile-Ife, Nigeria Omdurman Ahlia University, a university located in Omdurman, Sudan Operation OAU, a 1968 battle fought in Nigeria Old Azharians Union, part of Azhar College in Akurana, Sri Lanka