Look up opt, opt out, or opt-out in Wiktionary, the free dictionary.

OPT or Opt may refer for:

• /opt, a directory in the Filesystem Hierarchy Standard
• Option key, a modifier key on Apple keyboards
• OPT, the theoretically optimal page replacement algorithm, a page replacement algorithm for swapping out pages from memory

• Occupied Palestinian Territories, an alternative name for the State of Palestine
• Ocean Power Technologies, a US owned renewable energy company
• Office des postes et télécommunications, especially in French Polynesia (Office des postes et télécommunications de Polynésie française) and in New Caledonia
• Operation Prime Time, a consortium of TV Stations to provide alternative prime time programming
• Optical projection tomography, a form of tomographic tissue imaging used in biomedical research
• Optional Practical Training, a period during which university students with an F-1 are permitted by the United States Citizenship and Immigration Services (USCIS) to work for one year on a student visa
• Optimized Production Technology, a production planning system created by Eliyahu M. Goldratt
• Outdoor Payment Terminal, a name sometimes used for the self-service user interface hardware at fuel stations
• Oral pressure therapy, a treatment for obstructive sleep apnea
• Overseas Passenger Terminal, Sydney
• Obshchestvennoye Rossiyskoye Televideniye (Russian: Общественное Российское Телевидение, ОРТ in Cyrillic script), the former name of Channel One Russia, a public broadcaster in Russia
• Oxford Placement Test
• Onboard Performance Tool, aviation device for landing calculations based on weather and runway conditions

• Opt-out, to avoid receiving unsolicited product or service information
• Opting out, a political expression in Canada, describing the intention of a province to remove itself from a program administered by the federal government
• Opt in email, the option to receive bulk e-mail
• ORT (disambiguation), an acronym in Russian and Greek which appears like OPT

This disambiguation page lists articles associated with the title OPT.
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