CSAR may refer to:

• Alternate spelling of the title of nobility, Tsar
• Caris Spatial Archive, a file format for storing bathymetry data
• Center for the Simulation of Advanced Rockets
• Central South African Railways
• Combat search and rescue
• Cosa succederà alla ragazza, a music album by Lucio Battisti
• Comité secret d'action révolutionnaire, a French anti-communist group better known as La Cagoule

• Tieton Dam
• Tietong
• Tietsjerksteradeel
• Tie (typography)
• Tietz albinism-deafness syndrome
• Tietze
• Tietze (disambiguation)
• Tietze graph
• Tietze operation
• Tietze's Graph
• Tietze's graph
• Tietze's syndrome
• Tietzow Lake
• Tietzowsee
• Tietzow-See
• Tietzow See
• Tietz's syndrome
• Tietz 's syndrome
• Tietz Viktor
• Tietê Bus Terminal
• Tietê (disambiguation)
• Tieu Can
• Tie-up
• Tie up (basketball)
• Tie Uuteen Paeivaeaen