4R

4R may refer to:


 * 4R Family restaurants in Northern California
 * Galaxy 4R, a Panamsat-owned communications satellite
 * Ponceau 4R, a synthetic colourant
 * Hamburg International airline's IATA code
 * Nachtjagdgeschwader 2, from its historic Geschwaderkennung code with the Luftwaffe in World War II
 * Sri Lanka aircraft registration
 * A standard consumer print size for photographs. See Standard photographic print sizes
 * the Railroad Revitalization and Regulatory Reform Act, also known as the "4R Act"
 * the short-lived acronym for Neljä ruusua ('Four Roses'), a Finnish band, aiming for a broader international appeal
 * 4R, the production code for the 1977 Doctor Who serial The Robots of Death