MW4 may refer to:
MechWarrior 4: Vengeance, a 2000 video game MechWarrior 4: Mercenaries, a 2002 video game Call of Duty: Modern Warfare 4, a 2026 video game An abbreviation of master warrant officer in the United States Armed Forces a model of Microwriter, a hand-held portable word-processor
See also
Call of Duty 4: Modern Warfare