Amos Alonzo Stagg High School, Stagg, or AAS, is a public four-year high school located at the intersection of S. Roberts Rd. and W. 111th Street in Palos Hills, Illinois, a southwest suburb of Chicago, Illinois, in the United States. It is part of Consolidated High School District 230, which also includes Victor J. Andrew High School and Carl Sandburg High School.

It serves several areas: sections of Palos Hills, Palos Park, Bridgeview, Hickory Hills, Orland Park, Palos Heights, Willow Springs, and Worth. There is an area including a portion of Orland Park and a part of Palos Park which is zoned to Stagg but has Carl Sandburg High as an option.