Phi Delta Medical Fraternity () was a North American professional fraternity from 1901 to 1918. This medical fraternity was established at Long Island Hospital Medical College and merged with Kappa Psi in 1918.
Phi Delta Medical Fraternity was established in 1901 at the Long Island Hospital Medical College in Long Island, New York. This was called the Alpha Alpha chapter. The fraternity created a constitution and by-laws. It was overseen by a Grand Chapter.
In 1902, the Alpha Beta chapter opened at Ohio State University and the Alpha Gamma chapter at Albany College of Pharmacy at Union University in New York. Phi Delta became international in 1904 with the addition of Alpha Iota chapter at the University of Toronto in Canada. In total, sixteen chapters of Phi Delta formed between 1901 and 1912. Each chapter rented a chapter house.
Phi Delta held triennial conventions in Chicago or New York City. Its publication was called Black and Gold.
Phi Delta merged with the medical and pharmaceutical fraternity Kappa Psi on January 26, 1918. Before the merger, the fraternity had initiated 1,371 members.
The fraternity's badge was a monogram featuring the Greek letter "" over the letter "", with the chapter letters in the ring of the letter "". Its colors were black and gold.
The Phi Delta flag was a black pennant with a red Geneva cross in the center; the fraternity's letters are on either side of the cross in gold.
Following is a list of the chapters of Phi Delta, with inactive chapters and institutions indicated in italics.