MMHS can refer to several things:
Machias Memorial High School Manchester Memorial High School Maple Mountain High School (Utah) Mamdee Mollah High School Mardela Middle and High School Matthew Moss High School Morton Memorial Schools, at the Indiana Soldiers' and Sailors' Children's Home Mount Miguel High School Military Message Handling System Milliken Mills High School Minto Memorial High School Mira Mesa Senior High School Mundy's Mill High School Murdock Middle/High School Murrieta Mesa High School