VTAC may mean:
Victorian Tertiary Admissions Centre Vietnam Tactical Tomahawk VTAC, vertical design of a packaged terminal air conditioner (PTAC).
See also Ventricular tachycardia, or V-tach, an irregular beating of the heart Two-stroke power valve system#Honda V-TACS, a foot-operated power valve system made by Honda VTEC, a variable valve timing system used in Honda engines