RAD or Rad may refer to:

• Rad (film), a 1986 American sports film
• Rad (character), a villain in AC Comics's "Femforce"
• Rad Spencer, fictional character in the Bionic Commando video game series
• Bradley "Rad" White, fictional character in the Transformers Unicron Trilogy
• Rad (My-Otome), a fictional manga character
• Rad (video game), 2019
• Robot Alchemic Drive, a video game
• Rad (journal), a Croatian academic journal

• Rad Aviation, a defunct British aircraft manufacturer
• RAD Group, a number of independent companies in the networking and telecommunications industry
  • RAD Data Communications, an Israeli networking equipment manufacturer
• RAD Game Tools, a video game developer
• Reich Labour Service (Reichsarbeitsdienst), a paramilitary organization in Nazi Germany
• Rezvani Automotive Designs, American performance car manufacturer
• Rite Aid, New York Stock Exchange stock symbol RAD
• Royal Academy of Dance, British examination board for dance education and training
• Royal Association for Deaf people, British charity

• Rad Dougall (Robert Anthony Dougall, born 1951), South African racing driver
• Rad Hourani (born 1982), Canadian fashion designer and artist
• Rad Kortenhorst (Leonardus Gerardus Kortenhorst, 1886–1963), Dutch politician
• Rad Martinez (born 1978), American mixed martial artist
• Sydney Valpy Radley-Walters (1920–2015), nicknamed Rad, Canadian Army officer
• Rad Radford, a ring name of American wrestler Louis Mucciolo Jr. (1971–1998)

• Jahon Rad (born 2001), American soccer player, twin brother of Kaveh Rad
• Jovana Rad (born 1987), Serbian basketball player
• Kaveh Rad (born 2001), American soccer player, twin brother of Jahon Rad
• Taras Rad (born 1999), Ukrainian Paralympic cross-country skier and biathlete

• Rád, a village in Pest county, Hungary
• Rad (village), in Trebišov District, Slovakia
• Radnorshire, historic county in Wales
• Allegheny Regional Asset District, a special purpose unit of local government in Pennsylvania, U.S.

• Radian, symbol rad, a unit of angle
• Rad (radiation unit), a unit of absorbed radiation dose
• Radiation assessment detector, a scientific instrument on board the Curiosity rover
• Radical of an integer, rad (x), in number theory
• Rapid application development, a software development approach
• Reactive attachment disorder, an emotional disorder
• Reflex anal dilation, the reflexive dilation of the human anus
• Relative abundance distribution, a measure of biodiversity
• Restriction site associated DNA markers, a type of genetic marker
• Right axis deviation, a heart condition
• .rad file format, for Radiance (software)

• Rad (rune), an Anglo-Saxon rune
• Rade language, ISO 639-3 language code rad
• Radley railway station, England, station code RAD
• Rental Assistance Demonstration, an American federal public housing program
• Researchers Alliance for Development, a World Bank multidisciplinary network of researchers
• Rules for Archival Description, the Canadian archival descriptive standard
• FK Rad, a Serbian football club

• All pages with titles beginning with Rad
• Radiator, a heat exchanger
• Gerhard von Rad (1901–1971), German theologian