Phi Kappa Psi (ΦΚΨ), commonly known as Phi Psi, is an American collegiate social fraternity that was founded at Jefferson College in Canonsburg, Pennsylvania in 1852. The fraternity has over ninety chapters at accredited four-year colleges and universities throughout the United States. More than 179,000 men have been initiated into Phi Kappa Psi since its founding. Phi Kappa Psi and Phi Gamma Delta, both founded at the same college, form the Jefferson Duo.
Delta Kappa Epsilon (ΔΚΕ), commonly known as DKE or Deke, is one of the oldest fraternities in the United States, with fifty-six active chapters and five active colonies across North America. It was founded at Yale College in 1844 by fifteen sophomores who were discontented with the existing fraternity order on campus. The men established a fellowship where the candidate most favored was "he who combined in the most equal proportions the Gentleman, the Scholar, and the Jolly Good Fellow."
Delta Sigma Phi (ΔΣΦ), commonly known as Delta Sig, is a fraternity established in 1899 at The City College of New York (CCNY). It was the first fraternity to be founded based on religious and ethnic acceptance. It is also one of three fraternities founded at CCNY.
Alpha Delta Pi (ΑΔΠ), commonly known as ADPi, is an International Panhellenic sorority founded on May 15, 1851, at Wesleyan College in Macon, Georgia. It is the oldest secret society for women.
Alpha Sigma Phi (ΑΣΦ), commonly known as Alpha Sig, is an intercollegiate men's social fraternity with 181 active chapters and provisional chapters. Founded at Yale in 1845, it is the 10th oldest Greek letter fraternity in the United States.
Dartmouth College is host to many fraternities and sororities, and a significant percentage of the undergraduate student body is active in Greek life. In the fall of 2022, 35 percent of male students belong to a fraternity and 36 percent of students belong to a sorority. Greek organizations at Dartmouth provide both social and residential opportunities for students and are the only single-sex residential option on campus. Greek organizations at Dartmouth do not provide dining options, as regular meal service has been banned in Greek houses since 1909.
Alpha Delta Phi is a North American Greek-letter social college fraternity. Alpha Delta Phi was originally founded as a literary society by Samuel Eells in 1832 at Hamilton College in Clinton, New York. Its more than 50,000 alumni include former presidents and senators of the United States, and justices of the Supreme Court.
Phi Delta Theta (ΦΔΘ), commonly known as Phi Delt, is an international secret and social fraternity founded in 1848, and currently headquartered, at Miami University in Oxford, Ohio. Phi Delta Theta, along with Beta Theta Pi and Sigma Chi form the Miami Triad. The fraternity has over 200 active chapters and colonies in over 44 U.S. states and five Canadian provinces and has initiated more than 310,000 men between 1848 and 2024. There are over 180,000 living alumni. Phi Delta Theta chartered house corporations own more than 135 houses valued at over $141 million as of summer 2015. There are nearly 100 recognized alumni clubs across the U.S. and Canada.
Delta Upsilon (ΔΥ), commonly known as DU, is a collegiate men's fraternity founded on November 4, 1834, at Williams College in Williamstown, Massachusetts. It is the sixth-oldest, all-male, college Greek-letter organization founded in North America. It is popularly and informally known as "DU" or "Delta U" and its members are called "DUs". Although historically found on the campuses of small New England private universities, Delta Upsilon currently has 76 chapters/colonies across the United States and Canada. A number of its buildings are listed on the National Register of Historic Places.
Delta Phi (ΔΦ) is a fraternal society established in Schenectady, New York, on November 17, 1827. Its first chapter was founded at Union College, and was the third and final member of the Union Triad. In 1879, William Raimond Baird's American College Fraternities characterized the fraternity's membership as being largely drawn from the old Knickerbocker families of New York and New Jersey.
Omega Delta Phi Fraternity, Inc. (ΩΔΦ), also known as ODPhi is a multicultural fraternity that was founded on November 25, 1987, at Texas Tech University in Lubbock, Texas. The Fraternity has established itself on over 70 campuses and is predominantly centered in Texas and the Southwest. Although founded mainly by Latinos, the fraternity has traditionally always been open to men of different backgrounds.
Theta Nu Epsilon is a sophomore class society. Founded at Wesleyan University in 1870 as a chapter of Skull and Bones, the society expanded into a new national organization. It accepts members regardless of their fraternity status.
The College of the University of Chicago is the university's sole undergraduate institution and one of its oldest components, emerging contemporaneously with the university's Hyde Park campus in 1892. Instruction is provided by faculty from across all graduate divisions and schools for its 6,801 students, but the College retains a select group of young, proprietary scholars who teach its core curriculum offerings. Unlike many major American research universities, the College is small in comparison to the University's graduate divisions, with graduate students outnumbering undergraduates at a 2:1 ratio. The College is most notable for its core curriculum pioneered by Robert Maynard Hutchins, which remains among the most expansive of highly ranked American colleges, as well as its emphasis on preparing students for continued graduate study. 85% of graduates go onto graduate study within 5 years of graduation, higher than any other university, and 15–20% go on to receive PhDs.
The Phoenix – S K Club is an all-male final club at Harvard College, sometimes referred to as The Phoenix or The P.S.K. The society traces its earliest roots to 1897, forming from the amalgamation and reorganization of the Sphinx, Kalumet, and Phoenix Clubs. The Phoenix – S K clubhouse is located at 72 Mt. Auburn Street in Cambridge.
Phi Alpha Gamma (ΦΑΓ) was a professional fraternity for homeopathic medicine founded at the New York Homeopathic Medical College in 1894. Once the largest medical fraternity in the United States, It merged with Phi Chi in 1948.
The North American fraternity and sorority system began with students who wanted to meet secretly, usually for discussions and debates not thought appropriate by the faculty of their schools. Today they are used as social, professional, and honorary groups that promote varied combinations of community service, leadership, and academic achievement.
In North America, fraternities and sororities are social clubs at colleges and universities. They are sometimes collectively referred to as Greek life or Greek-letter organizations, as well as collegiate fraternities or collegiate sororities to differentiate them from traditional not (exclusively) university-based fraternal organizations and fraternal orders that have historically acted as friendly societies or benefit societies to certain groups unlike the ones mentioned in this article.
Alpha Delta Phi Society, also known as The Society or Adelphi Society, is a United States Greek-letter literary and social society that is gender-inclusive. The society formed in 1992 when four chapters withdrew from the all-male Alpha Delta Phi fraternity. Legally, the two groups are separate entities with different ideologies but continue to share traditions.
