List of Trine University fraternities and sororities

Following is a list of Trine University fraternities and sororities. Fraternities and sororities have been a visible presence on the Trine University campus for 100 years. The campus hosts ten honor societies that recognize scholastic achievement, complimenting 13 active undergraduate social fraternities and sororities. Local societies had been predominant during the earlier, non-accredited era of campus growth, but beginning in 1947, national fraternities and then sororities colonized and now make up the majority of chapters. Tri-State's first men's social fraternity, Sigma Mu Sigma formed in 1921, and its first women's social sorority, Sigma Alpha Gamma (local) formed in 1926.

As of 2018, 26% of male and 19% of female undergraduates are involved in these groups.

Fraternities
A list of fraternities on campus follows. Active groups in bold and inactive groups in italics. (NIC) indicates members of the North American Interfraternity Conference. (FFC) indicates members of the Fraternity Forward Coalition. (PFA) indicates members of the Professional Fraternity Association.

Active Fraternities

 * Acacia, 1967–1979, 2012 (NIC)
 * Alpha Sigma Phi, 1935 (FFC, formerly NIC)
 * Delta Chi, 1969 (NIC)
 * Kappa Sigma, 1966 (formerly NIC)
 * Phi Kappa Theta, 1966 (NIC)
 * Sigma Phi Delta, 1947 engineering professional (formerly PFA)
 * Sigma Phi Epsilon, 1968 (formerly NIC)
 * Tau Kappa Epsilon, 1947–1948, 1989 (NIC)

Inactive fraternities

 * Alpha Delta Alpha, 1930–1934, became Alpha Kappa Pi
 * Alpha Gamma Omega (local), 1940–1965, became Phi Kappa Theta
 * Alpha Gamma Upsilon, 1949–1968, became Sigma Phi Epsilon
 * Alpha Kappa Pi, 1935–1946, became Alpha Sigma Phi
 * Alpha Lambda Tau, 1936–1947, became Tau Kappa Epsilon
 * Beta Phi Sigma (local), 1922–1932, became Delta Kappa Phi
 * Beta Phi Theta, 1929–1969, became Delta Chi
 * Beta Sigma Chi, 1960–1966?, revived Tau Kappa Sigma
 * Beta Sigma Tau, 1950–1960, became Beta Sigma Chi
 * Catholic Club (local), 1929–1940, became Alpha Gamma Omega
 * Delta Kappa Phi, 1932–1936
 * Four-Eleven Gang (local), 1922–1927, became Lambda Phi Epsilon
 * Gamma Eta Alpha (local), 1927–1931, became Phi Iota Alpha
 * Kadimah Society, 1936–1948, became Theta Mu Phi
 * Kappa Sigma Kappa, 1952–1962, reverted to Sigma Mu Sigma
 * Lambda Phi Epsilon (local), 1927–1929, became Beta Phi Theta
 * Nu Pi (local), 1981–1989, became Triangle
 * Phi Iota Alpha, 1931–1955 (NALFO and NIC)
 * Phi Lambda Alpha, 1929–1931, became Phi Iota Alpha
 * Phi Lambda Tau (local), 1925–1929, became Alpha Delta Alpha
 * Phi Sigma Chi, 1927–1934, 1936–1949, became Sigma Delta Rho, reverted to Phi Sigma Chi, became Alpha Gamma Upsilon
 * Sigma Delta Rho, 1934–1936, (NIC), reverted to Phi Sigma Chi, later became Alpha Gamma Upsilon
 * Sigma Mu Sigma, 1921–1936, 1940–1952, 1962–1966, became Alpha Lambda Tau, Kappa Sigma, Tau Kappa Epsilon, Kappa Sigma Kappa and Acacia
 * Square M Club (local), 1921-1921, became Sigma Mu Sigma
 * Tau Kappa Lambda (local), 1949–1952, became Kappa Sigma Kappa
 * Tau Sigma (local), 1970–1981, became Nu Pi
 * Theta Mu Phi, 1948–1950, became Beta Sigma Tau
 * Triangle, 1989–2008 (NIC)

Sororities
A list of the sororities on campus follows. Chapters are listed in order of date established, with active groups in bold and inactive groups in italics. (NPC) indicates members of the National Panhellenic Conference. (local) indicates a chapter unaffiliated with a national organization.

Active sororities

 * Alpha Sigma Tau, 2008 (NPC)
 * Gamma Phi Epsilon (local), 1995
 * Kappa Sigma Alpha (local), 1991
 * Theta Phi Alpha, 2012 (NPC)

Inactive sororities

 * Alpha Omega Epsilon (local), 1999–2002, 2004–2006, became Alpha Sigma Tau
 * Alpha Theta Pi (local), 2005–20xx ?
 * Kappa Beta Gamma, 2011–2016
 * Kappa Tau Sigma (local), 1954-19xx ?
 * Lambda Rho Mu (local), 19xx ?–19xx ?
 * Omega Kappa (local), 1960?–19xx ?
 * Phi Sigma (local), 1996–2023
 * Phi Sigma Sigma, 1992–1996 (NPC), became Phi Sigma
 * Sigma Alpha Gamma (local), 1926-193x ?
 * Sigma Kappa, 1977–1983 (NPC)
 * Zeta Eta Theta (local), 1982–19xx ?
 * Zeta Theta Epsilon (local), 1998–2012, became Theta Phi Alpha

Honor and professional fraternities
Trine University hosts several honor societies. These include:
 * Pi Tau Sigma, 1972, honor, mechanical engineering
 * Chi Epsilon, 1973, honor, civil and environmental engineering
 * Tau Beta Pi, 1975, honor, engineering
 * Eta Kappa Nu, 1975, honor, electrical engineering
 * Delta Mu Delta, 1977, honor, business
 * Omega Chi Epsilon, 1980, honor, chemical engineering
 * Beta Beta Beta, 1980, honor, biological sciences
 * Pi Sigma Alpha, 1981, honor, political sciences
 * Phi Eta Sigma, 1983, honor, first-year academic achievement
 * Order of Omega, 2008, honor, Greek Life leadership
 * Sigma Tau Delta, honor, English
 * Lambda Alpha Epsilon, honor, criminal justice