ONT

• Organización Nacional de Transplantes (National Transplant Organization), a Spanish government agency
• Ordo Novi Templi (Order of the New Templars), an occult anti-semitic society founded 1907 by Lanz von Liebenfels
• Ontario Network Television, a predecessor of the defunct Canadian Baton Broadcast System
• Obshchenatsional'noe Televidenie (All-National Television), a Belarusian national television station
• Oxford Nanopore Technologies, a UK-based nanopore sequencing company

• On Ting stop (MTR station code ONT), a Light Rail stop in Hong Kong
• Ontario International Airport (IATA code ONT), a public airport in Ontario, California, US
• Ontario Northland Railway, a Canadian railway operated by the Ontario Northland Transportation Commission

• Optical network terminal, an interface between a company's fiber optic network and premises wiring
• Ortho-nitrotoluene, an organic compound

• Ontario (Ont.), a province of Canada
• Ontology

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• Ontario (disambiguation)

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