4M

4M or 4-M may refer to:


 * 4m, or 4 metres
 * 4-meter band in amateur radio
 * 4M, a model of Toyota M engine
 * 4M, a model of Mitsubishi 4M4 engine
 * 4M, a model of HP LaserJet 4
 * DC-4M, a designation of Canadair North Star
 * A-4M, a model of Douglas A-4 Skyhawk
 * Fokker DH-4M, see Airco DH.4
 * VF-4M, see VMA-211
 * VB-4M, see VMFA-232
 * PB-4M, see Osa (handgun)
 * Sun-4m, a model of Sun-4 workstation
 * Mayall 4m telescope, see Nicholas U. Mayall Telescope
 * Meade 4M Community, an astronomy awareness community sponsored by Meade Instruments
 * LATAM Argentina, a defunct airline based in Buenos Aires, Argentina
 * J-4M, see Barnett J4B
 * 4M of manufacture industries are Man, Money, Material and Machine. Also see resource management and Ishikawa diagram.
 * 4M Software applications for Engineers, see IDEA Architectural and FINE MEP
 * 4M, Manfred Memorial Moon Mission, first commercial Moon mission
 * 4M, the production code for the 1976 Doctor Who serial The Masque of Mandragora