OPD

OPD may refer to:

• o-phenylenediamine, a chemical compound
• Oakland Police Department (California), a law enforcement agency in the United States
• Office of Public Diplomacy, an intra-agency organization in the United States
• Oldcastle Products and Distribution
• Omaha Police Department, a law enforcement agency of the city of Omaha, Nebraska, USA
• Optical path difference
• Organizational Process Definition
• Original Promise Due Date Performance, a customer satisfaction indicator
• Orlando, Florida Police Department, a law enforcement agency of the city of Orlando, Florida, USA
• Outsourced product development, a type of business activity
• Overfill Protection Device, a safety mechanism incorporated in the valves of propane cylinders
• Pico dos Dias Observatory, an astronomical observatory

Information technology

• Object Process Diagram, in object oriented programming
• Office Products Division, a division in IBM
• OmniPage Document, .opd, a file format (and file name extension)
• One Per Desk, an integrated personal computer and telecommunications terminal produced by ICL in the 1980s

Medicine

• Oculopharyngeal muscular dystrophy, a muscle disease
• Outpatient department, a hospital department where patients do not stay overnight