Delta Theta Psi may refer to:
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.
While the traditional social fraternity is a well-established mainstay across the United States at institutions of higher learning, alternatives – in the form of social fraternities that require doctrinal and behavioral conformity to the Christian faith – developed in the early 20th century. They continue to grow in size and popularity.
While most of the traditional women's fraternities or sororities were founded decades before the start of the 20th century, the first ever specifically Christian-themed Greek Letter Organization formed was the Kappa Phi Club, founded in Kansas in 1916. Kappa Phi was a women's sisterhood that developed out of a bible study and remains one of the largest nationally present Christian women's collegiate clubs today. Later organizations added more defined social programming along with a Christian emphasis, bridging the gap between non-secular traditional sororities and church-sponsored bible study groups, campus ministries and sect-based clubs and study groups.

Theta Upsilon (ΘΥ) was a national women's fraternity operating in the United States from February 1921 until May 1962, when the group was absorbed by the Delta Zeta sorority.

Kappa Phi Lambda (ΚΦΛ) was an American collegiate fraternity. It was established in 1862 at Jefferson College and was dissolved in 1874. Kappa Phi Lambda is considered one of the members of the "Jefferson Triad" of fraternities founded at Jefferson College, with the other two being Phi Gamma Delta and Phi Kappa Psi. However, with the demise of Kappa Phi Lambda, the remaining two fraternities are known as the Jefferson Duo.
Washington & Jefferson College is host to 8 Greek organizations and a significant percentage of the undergraduate student body is active in Greek life. With 43% of women and 40% of men of the student body participating in "greek life," fraternities and sororities play a significant role in student life at W&J. The Princeton Review named Washington & Jefferson College 12th on their 2010 list of "Major Frat and Sorority Scene" in the United States. As of 2024, the Office of Fraternity & Sorority Life recognized 4 fraternities, Alpha Tau Omega, Beta Theta Pi, Delta Tau Delta, and Phi Kappa Psi, and 4 sororities, Delta Gamma, Kappa Alpha Theta, Kappa Kappa Gamma, and Pi Beta Phi. The fraternities are governed by a local Interfraternal Council and the sororities are governed by a local Panhellenic Council, while the Greek Judiciary manages broad policy violations at the chapter-level. All Greek organizations occupy College-owned houses on Chestnut Street on campus. All members of fraternities and sororities must pay the $100 "Greek Membership Fee," a levy designed to fund leadership seminars and other educational events for Greeks.

Theta Sigma Upsilon (ΘΣΥ) was an American sorority founded on March 25, 1921 at Emporia State University. It chartered 23 chapters in the United States. The sorority merged with Alpha Gamma Delta on June 29, 1959.