Tau Delta Phi, whose members are commonly known as Tau Delts, is a national social fraternity founded on , in New York City.

(commonly known as Alpha Delt, AD, ADPhi, A-Delt, or ADP) a North American Greek-letter social college fraternity.

Delta Sigma Phi, commonly known as Delta Sig, is a fraternity established in 1899 at The City College of New York.

Phi Delta Phi, commonly known as Phid or PDP, is an international legal honor society and the oldest legal organization in continuous existence in the United States.

(officially the Delta Lambda Phi Social Fraternity; DLP or Lambda) an international social fraternity for gay, bisexual, transgender and progressive men.