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