HS3

HS3 or HS-3 may refer to:

Transport

 * 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

Other uses

 * HS3, a part of the British HS postcode area
 * 2008 HS3, an asteroid