OCU

OCU may mean:
 * Ohio Christian University
 * Oklahoma City University
 * Operational conversion unit, a unit in an air force
 * Operational Command Unit, a unit in a police force
 * Operator Control Unit, a hardware or software control interface for an automated system
 * One Cohesive Unit, a nickname for Annville-Cleona's men's high school soccer team
 * Organizacion de Consumidores y Usuarios, a consumer organization in Spain, part of Euroconsumers
 * Organized Chaos Unit, a unit of armed Citizens
 * Orthodox Church of Ukraine
 * Osaka City University, a public university in Osaka, Japan
 * Overseas Chinese University, a university in Taichung, Taiwan