Quadrant may refer to:
Primary (geometrical) meanings:
- A sector equal to one quarter of a circle, or half a semicircle, see Circular sector
- Quadrant (plane geometry), a sector of a two-dimensional cartesian coordinate system
- Quadrant (solid geometry)
- A quadrant or section in a city street nomenclature system, see Address (geography)#Quadrants
Secondary meanings:
- Quadrant (anatomy), a division of the abdominal cavity
- Quadrant (architecture) a building which arcs in 90 degree manner
- Quadrant (astronomy), a rectangular division of the celestial sphere
- Galactic quadrant, one of four circular sectors in the division of the Milky Way galaxy
- Quadrant (instrument), an angle or time measuring instrument
- Quadrant (motorcycles)
Proper names:
- Quadrant Cycle Company, 1899 manufacturers in Britain of the Quadrant motorcar
- Quadrant (magazine), an Australian journal
- Quadrant (album), a 1977 album by Joe Pass and Milt Jackson
Names of places etc.
- Quadrant Bus Station, Swansea Wales
- Quadrant Shopping Centre, Swansea, Wales
- Quadrant Park, a nightclub in Liverpool, Merseyside
- Quadrant:MK, Network Rail's headquarters campus in Milton Keynes
- HMS Quadrant (G11), a Second World War British/Australian warship
- First Quebec Conference, 1943 (codenamed "QUADRANT")
- Quadrant Records, an independent record label
- Triumph Quadrant, a four-cylinder motorcycle