M3K

M3K may refer to:


 * M3K (postal code), Toronto, Ontario, Canada; see List of postal codes of Canada: M
 * MAP kinase kinase kinase (M3K)
 * M3K (pro-wrestlers), a Japanese pro-wrestling stable of Masaaki Mochizuki, Mochizuki Jr, Susumu Mochizuki, and, Yasushi Kanda, on the Dragongate wrestling promotion tour; wrestling in 2002 and 2023; see List of Dragon Gate personnel
 * M3K (amphibious military truck), a variant of the M3 Amphibious Rig bridging vehicle