OCR
OCR-A
Indic OCR
OCR Nationals
OCR Systems
OCR-B
Comparison of optical character recognition software
OCR Kings
OCR FM
Asprise OCR
Optical Character Recognition (Unicode block)
Oxford, Cambridge and RSA Examinations
Optical character recognition
Tesseract (software)
World Obstacle
Organization of Communist Revolutionaries (Marxist–Leninist)
Optical music recognition
US Sailing's Miami Olympic Classes Regatta
Handwriting recognition
ISO/IEC 646
The Orange County Register