Donar is an Old High German name for the Germanic thunder god, known to the Norse as Thor.

Donar may also refer to:

• Donar (basketball club), a professional basketball club based in Groningen, Netherlands
• Johan Donar, a Swedish tennis player
• a version of the Artillery Gun Module, a German self-propelled howitzer
• 2176 Donar, a minor planet
• Donar Fluctus, an area of lava flow on Jupiter's moon Io
• German trawler V 5113 Donar, a German ship of World War II
• a web platform developed by Fundación Ciudadano Inteligente, a Chilean non-profit organization
• a character in the Starz TV series Spartacus