Phi Delta Pi (ΦΔΠ) was a national professional fraternity for women in the disciplines of health and physical education, health sciences, and recreation.^[1]

Phi Delta Pi was founded on October 23, 1916 at the Normal College of the North American Gymnastics Union.^[2]

Phi Delta Pi was one of the eleven women's professional fraternities to found the Professional Panhellenic Association in 1925.^[1]

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 March 1970.^[2]

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). Chapters known to be active at the time of merger in bold, inactive chapters in italics. ^[2]

Four types of membership existed in Phi Delta Pi:^[1]

• Active
• Alumni
• Honorary
• Special Membership

Notable Honorary Members include:^[1]

• Maud May Babcock, pioneer leader in physical education in Salt Lake City, UT.
• Lillian Schoedler, former secretary of the Women's Division of the NAAF.
• Jane Deeter Rippin, past National Director of the Girl Scouts of the United States of America.
• Grace E. Jones, Supervisor of Health and Physical Education, Summit, NJ.
• Helen E. Manley, Director of Health and Physical Education, University City, MO. President of the American Association for Health, Physical Education, and Recreation, University City, MO.
• Anne Schley Duggan, Director of Health and Physical Education, Texas State College for Women, Denton, TX.