Theta Alpha Phi is an American honor society for theatre. It was established in 1919 by members of the National Association of Teachers of Speech. It was organized in December 1919 at a National Association of Teachers of Speech meeting in Chicago, Illinois. Its first chapter, "Oklahoma Alpha", was chartered on at Oklahoma A&M College, now Oklahoma State University in Stillwater, Oklahoma.
In the following list, active chapters are noted in bold and inactive chapters and institutions are in "italics".