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HS3 or HS-3 may refer to:
- Curtiss HS-3, a patrol flying boat built for the United States Navy during World War I
- Helicopter Antisubmarine Squadron 3, a United States Navy unit renamed to HSC-9 in 2009 (Helicopter Sea Combat Squadron 9)
- High Speed 3: a proposal to improve rail links in northern England now called Northern Powerhouse Rail
- HS3, a part of the British HS postcode area
- 2008 HS3, an asteroid
- Woodgrove High School, a public secondary school in Purcellville, Virginia
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