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H13, H-13 or H.13 may refer to:
- H-13 (Michigan county highway), a road in the United States
- Highway H13 (Ukraine), a road in Ukraine
- London Buses route H13, a public transportation route in England
- H-13 Sioux or Bell 47, a helicopter flown by the armies of U.S. and U.K. in the Korean War
- HMS H13, a United Kingdom Royal Navy H-class submarine commissioned in 1918
- LeO H-13, a 1922 French biplane two-engine flying boat
- LSWR H13 class, a British LSWR Locomotive model
- DIN 1.2344 tool steel, a tool steel grade
- Disorders of conjunctiva in diseases classified elsewhere ICD-10 code
- A class of high-efficiency particulate air filter
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