5R

5R may refer to :
 * Yaesu VX-5R, an ultra-compact amateur radio transceiver
 * Karthago Airlines IATA designator
 * Madagascar aircraft registration code
 * A standard consumer print size for photographs. See Standard photographic print sizes.
 * 5R, the production code for the 1980 Doctor Who serial Full Circle
 * 5R Fulton Rapid, a San Francisco bus line