Phi Mu Delta (ΦΜΔ) is a national fraternity founded on March 1, 1918, at the Universities of Connecticut, New Hampshire, and Vermont.

Phi Mu Delta was originally derived from the National Federation of Commons Clubs (NFCC), which had formed at Wesleyan University in 1899.

He intended to bring all 19 active Commons Clubs chapters into this new organization which he had named Phi Mu Delta.

But upon their return, alumni of Union College's Commons Club, upon hearing the news refused to allow their undergraduate chapter to join.

A reorganization effort centered on the State College, Pennsylvania chapter, stabilized the fraternity and prompted a resurgence in growth.

The badge of the fraternity is a black triangle, bordered with pearls, with the letters Φ, Μ, and Δ, rendered in gold, and set about a sapphire center stone.

[1] The coat of arms displays a lion bearing a shield, under which runs a ribbon with the Greek letters of the fraternity's name.