Guinevere may refer to:

Queen Guinevere from Arthurian legend, or works about her: Queen Guinevere, by William Morris For other uses, see Guinevere (disambiguation). ... The Matter of Britain is a name given collectively to the legends that concern the Celtic and legendary history of the British Isles, centering around King Arthur and the knights of the Round Table. ...

• Guinevere (1994 film), a television movie
• The Guenevere Trilogy of fantasy novels by Rosalind Miles
  • Guenevere, Queen of the Summer Country, the first of Miles' series
• The Guinevere Series of historical novels by Sharan Newman
  • Guinevere (Newman novel), the first of Newman's series

Other Rosalind Miles was born and raised in England and now lives in both Los Angeles & Kent, England. ...

• Guinevere (film), a film not about the Guinevere of legend.
• Guinevere (software), an email filtering software

Gwenhwyfar or Gwenhwyvar, the Welsh version of the name, can also refer to: Guinevere is a 1999 motion picture about the artistic and romantic relationship between a young student and her older mentor. ... Guinevere is a mail filter program that is built for use with the GroupWise e-mail system. ... Welsh redirects here, and this article describes the Welsh language. ...

• Guenhwyvar (cat), a panther from Dungeons & Dragons
• Three wives of Arthur, all named Gwenhwyfar, are named in an enigmatic Welsh Triad