CAIR or Cair may refer to:
Acronyms
Carboxyaminoimidazole ribotide, a biochemical intermediate nucleotide Centre for Artificial Intelligence and Robotics, Indian national defence laboratory Clean Air Interstate Rule, US environmental regulation Council on American–Islamic Relations, American Muslim advocacy organization
Geography
Cair, an alternate spelling of caer, a Welsh placename element referring to strongholds Čair Municipality, municipality of Skopje, Republic of North Macedonia
Fictional Cair Andros, a fictional island in Tolkien's fiction Cair Paravel, a castle from C. S. Lewis' The Chronicles of Narnia