OPD

OPD may refer to:

Police departments

 * Oakland Police Department, a U.S. law enforcement agency in California
 * Omaha Police Department, a U.S. law enforcement agency in Nebraska
 * Orlando Police Department, a U.S. law enforcement agency in Florida

Other uses

 * o-phenylenediamine, a chemical compound
 * Object Process Diagram, in object oriented programming
 * One Per Desk, a 1980s personal computer and telecommunications terminal
 * Optical path difference
 * Organizational Process Definition
 * Outpatient department, part of a hospital
 * Overfill Protection Device, a safety mechanism incorporated in the valves of propane cylinders
 * Pico dos Dias Observatory, a Brazilian astronomical observatory
 * Office of Public Diplomacy, a US propaganda agency during the Reagan era
 * Organic personality disorder