Phi Delta Pi () was a national professional fraternity for women in the disciplines of health and physical education, health sciences, and recreation. It was established in 1916 at the Normal College of the North American Gymnastics Union (now Indiana University School of Health and Human Sciences). It merged with Delta Psi Kappa, a professional fraternity, in .
Phi Delta Pi was founded on at the Normal College of the North American Gymnastics Union in Indianapolis, Indiana. It was a national professional fraternity for women in the disciplines of health and physical education, health sciences, and recreation.
Phi Delta Pi was one of the eleven women's professional fraternities to found the Professional Panhellenic Association in 1925.
Many of its early chapters were placed at vocational-oriented Normal Schools for Physical Education which did not survive the Great Depression. Later chapters were placed at colleges with broader course offerings and stronger financial footing. Baird's reports there were fourteen active chapters and sixteen inactive chapters in 1967, but provides only twenty chapter names in the 20th Edition of that resource.
Phi Delta Pi merged with Delta Psi Kappa, a professional fraternity, in .
The colors of Phi Delta Pi were purple and gold. Its symbol was the oak leaf. Its flower was the purple violet. Its jewel was the amethyst.
Four types of membership existed in Phi Delta Pi: active, alumnae, honorary, and special membership.
The chapters of Phi Delta Pi were as follows; this list may be incomplete, and some chapters here listed as inactive may have merged or been absorbed only as alumni clubs (no active chapters). Inactive chapters and institutions are indicated in italics.