Alpha Delta Sigma is an American honor fraternity for advertising. It started in 1913 at the University of Missouri, a men's professional fraternity, and absorbed Gamma Alpha Chi in 1971. It merged into the American Advertising Federation in 1973, becoming an honor society at the time.
Originally, Alpha Delta Sigma's chapters were named for prominent members of the field, prominent alumni, or members of a host institution's faculty. Following is a list of Alpha Delta Sigma chapters.