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Quad may refer to:

• Quadrangle in architecture, e.g., on a university campus
• Quad, a dormitory room or suite housing four residents

• Quad Damage, a Quake power-up
• Quad, a type of combined robotic enemy in the Nintendo Gamecube game Metroid Prime 2
• Quad (more commonly Quads), four of a kind in poker

• Quad (play), by Samuel Beckett
• Quad (music), a musical project by Gary Ramon
• Quad Electroacoustics, a British manufacturer of electronic amplifiers, tuners and loudspeakers mainly for the high-end domestic market
• Quadraphonic, or four-channel sound
• Quad Toms, marching percussion instrument
• Quad, a film poster in the United Kingdom typically measuring 30 x 40 inches

• Quadriceps, a muscle
• Quadruped, a creature or mechanism which moves on four legs
• Quad (energy), a unit of energy (short for quadrillion) defined as 10¹⁵ British thermal units (about 1.055 exajoule (EJ) or 1.055 × 10¹⁸ J)
• Quadrilateral, a four sided figure in plane geometry
• Quadratic, the second power in mathematics
• A 7.5-minute topographic map produced by the United States Geological Survey, covering in greater detail one quarter of the area of a 15-minute map

• Quadrangle Club, one of the ten eating clubs at Princeton University
• Quadruple combination, the Bible, Book of Mormon, Doctrine and Covenants and Pearl of Great Price published together in a single volume

• Quad, a chairlift in skiing which carries four persons
• Quad, a jump with four revolutions in figure skating
• Quad skates, roller skates with two wheels on each of two axles

• Quad precision, a number stored using 16 eight-bit bytes, which is four times the size of 4-byte single precision
• Quad Electroacoustics, a British manufacturer of electronic amplifiers, tuners and loudspeakers mainly for the high-end domestic market
• Quad, an abbreviation for a type of videotape recorder, especially 2" Quadruplex videotape, where there are four record heads on a spinning drum which move perpendicular to the direction of tape travel
• Quad, telecommunication term referring to a cable with four conductors in a square formation used to form either two balanced pairs
• Star quad, a cable with four conductors in a square formation, in which opposite conductors are connected in parallel at both ends to form a single, magnetically-concentric balanced pair, in order to minimise magnetic induction
• Quadraphonic, or four-channel sound

• Quadruple combination fire apparatus that features a pump, tank, hose and a full complement of ground ladders
• Quad bike or quad cycle, a four wheeled all-terrain vehicle
• Quad, a tandem bicycle with four seats
• Quad, a muscle car with a four-barrel carburetor
• Quad, the nickname of the Morris C8 artillery gun tractor

• Quad Cities, a region which includes the cities of Bettendorf, Iowa, Davenport, Iowa, Moline, Illinois, and Rock Island, Illinois
• Quad, a slang reference for a quarter-ounce (7 grams) of various drugs, most commonly marijuana
• Quad, a derogatory term for a quadriplegic
• Quad, a trade negotiation term for the countries of the United States, Japan and Canada, plus the European Union
• Quad (Star Trek), a unit of measurement in the fictional Star Trek universe
• Quad cannon, an anti-air weapon
• John Callahan's Quads!, an animated series from Nelvana