Phi Kappa Theta (ΦΚΘ), commonly known as Phi Kap, is a national social fraternity that has over 35 active chapters and colonies at universities across 21 U.S. states. The fraternity was founded on April 29, 1959, at Ohio State University in Columbus, Ohio, with the agreed-upon merger of two older Catholic fraternities, Phi Kappa and Theta Kappa Phi. Phi Kappa was founded exactly 70 years prior in 1889 at Brown University in Providence, Rhode Island, while Theta Kappa Phi was founded later in October 1919 at Lehigh University in Bethlehem, Pennsylvania.

In North America, fraternities and sororities are social organizations at colleges and universities. They are sometimes collectively referred to as Greek life. Generally, membership in a fraternity or sorority is obtained as an undergraduate student but continues thereafter for life. Some accept graduate students as well. Individual fraternities and sororities vary in organization and purpose, but most share five common elements:Secrecy Single-sex membership Selection of new members based on a two-part vetting and probationary process known as rushing and pledging Ownership and occupancy of a residential property where undergraduate members live A set of complex identification symbols that may include Greek letters, armorial achievements, ciphers, badges, grips, hand signs, passwords, flowers, and colors