CR3

CR3 or CR-3 may refer to:

Science and technology

 * Macrophage-1 antigen, an immunological cell surface receptor for a complement component
 * CR3, an x86 microprocessor control register
 * CR3, a raw image format used by Canon digital cameras since 2018

Transportation

 * Cessna CR-3, a racing aircraft designed in 1933
 * Curtiss CR-3, a racing aircraft designed in 1921
 * County Road 3 (disambiguation), several roads
 * Loyang MRT station, Singapore, station code CR3

Other uses

 * The royal cypher C III R (sometimes written as CR III) for Charles III Rex (Charles III, King)
 * Crystal River 3 Nuclear Power Plant
 * CR3, a postcode district in the CR postcode area