Armbrust is a surname. Notable people with the surname include:
Barbara Armbrust (born 1963), Canadian rower E. Virginia Armbrust Biological oceanographer Heather Armbrust (born 1977), American professional bodybuilder Orville Armbrust (1908–1967), Major League Baseball pitcher Tobin Armbrust, American film producer
Fictional characters: Armbrust, a character of the anime series Kiddy Grade Crow Armbrust, character from hit video game series Trails.
Places Armbrust, Pennsylvania
Other Armbrust cup, an emergency hydration device