Castor

Castor most commonly refers to:
 * Castor (star), a star in the Gemini constellation
 * Castor, one of the Dioscuri/Gemini twins Castor and Pollux in Greco-Roman mythology

Castor or CASTOR may also refer to:

Science and technology

 * Castor (rocket stage), a family of solid-fuel rocket stages
 * Castor (software), data binding framework for Java
 * CASTOR (nuclear waste), cask for storage and transport of radioactive material
 * CASTOR experiment, "Centauro and Strange Object Research" at CERN
 * CASTOR (spacecraft), proposed space telescope
 * Castor sugar, fine sugar
 * Caster (or Castor), an undriven wheel
 * Caster (or Castor) angle, relevant to a steered wheel

Biology

 * Castor oil plant, plant from which castor bean grows
 * Castor oil, oil of the castor bean
 * Castor wax, produced from castor oil
 * Castor, a genus name of the beaver
 * Castoreum, natural scent derived from the beaver

Ancient

 * Castor of Rhodes, Greek grammarian and rhetorician
 * Drusus the Younger (13 BC – 23 CE), Roman consul, son of the Emperor Tiberius, nicknamed "Castor"
 * Antonius Castor, ancient botanist
 * Saint Castor, the name of several Christian saints
 * Castor of Apt (died c. 420), French bishop of Apt
 * Castor of Karden (died c. 400), German priest and hermit

Modern

 * Castor Cantero (1918–?), Paraguayan football player
 * Castor McCord (1907–1963), American jazz saxophonist
 * Castor (footballer) (born 1979), Edmilson Ferreira, Brazilian footballer

Surname

 * Betty Castor (born 1941), American educator and politician
 * Brian Castor (1889–1979), English cricketer
 * Bruce Castor (born 1961), American lawyer and politician
 * George A. Castor (1855–1906), American politician
 * Helen Castor (born 1968), English historian
 * Jean-Victor Castor (born 1962), French politician
 * Jimmy Castor (1940–2012), American musician
 * Kathy Castor (born 1966), American politician
 * Stacey Castor (1968–2016), American murderer
 * Steve Castor (born 1972/1973), American lawyer

Fiction

 * Castor Oyl, fictional character in the Popeye cartoons
 * Castor Troy, fictional character in the 1997 movie Face/Off, portrayed by Nicolas Cage and John Travolta
 * Castor, fictional character in the video game Spartan: Total Warrior
 * Lord Castor, fictional character in the 2007 movie The Harpy
 * Castor, fictional character in Tron: Legacy, portrayed by Michael Sheen
 * "Castor, Gobernador" fictional character in The Courts of the Morning by John Buchan
 * "Castor Wilds" fictional location in The Legend of Zelda: The Minish Cap by Nintendo
 * "Castor", fictional persona in the video game Persona 3. Castor is used by one of the playable characters, Shinjiro Aragaki

Places

 * Castor, Alberta, Canada
 * Queue de Castor River, Eeyou Istchee Baie-James, Jamésie, Nord-du-Québec, Canada
 * Rivière aux Castors Noirs, river in Quebec, Canada
 * Castor River (Ontario), Ontario, Canada
 * Castor, Louisiana, Louisiana, United States
 * Castor Creek, Louisiana, United States
 * Castor River (Missouri), United-States
 * Castor (mountain), in the Pennine Alps on the border between Switzerland and Italy
 * Castor Bay, Auckland, New Zealand
 * Castor, Cambridgeshire, England
 * Castor Temple, a summit in the Grand Canyon, United States
 * Castor, an old name for Caistor St. Edmund, Norfolk, England
 * Castor (crater) on Saturn's small moon Janus

Other uses

 * Castor (band), American rock band
 * Castor (cloth), a woollen fabric
 * Castor (trucks), a brand used by Swedish truck manufacturers Tidaholm in the 1910s
 * Castor Cracking Group, Swedish music group
 * HMS Castor, the name of more than one ship of the British Royal Navy
 * Castor (1782 ship), a vessel launched in 1782 that made one voyage to Bengal for the British East India Company and that was last listed in 1808.
 * Castor gloves, gloves made from the skin of lambs or deer
 * Castor hat
 * Project Castor, a set of male clones in the TV series Orphan Black
 * Castore (brand), British sportswear and athletic clothing company