CR3
# 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
