5Z

5Z or 5-Z may refer to:


 * 5Z, IATA code for CemAir
 * 5Z, the production code for the 1982 Doctor Who serial Castrovalva
 * R5D-5Z, a variant model of Douglas C-54 Skymaster
 * R4D-5Z, a variant model of Douglas C-47 Skytrain