| Phi Sigma Kappa | |
|---|---|
| ΦΣΚ | |
 | |
| Founded | March 15, 1873 Massachusetts Agricultural College |
| Type | Social |
| Affiliation | NIC |
| Status | Active |
| Scope | International |
| Motto | "Do unto others as you would have them do unto you" |
| Pillars | Brotherhood, Scholarship, Character |
| Colors | Cardinal Red and Silver |
| Symbol | Triple T's |
| Flag |  |
| Flower | Red carnation and White tea rose |
| Mascot | Owl |
| Publication | The Signet |
| Chapters | 77 active |
| Headquarters | 2925 East 96th Street Indianapolis, Indiana 46240 United States |
| Website | www |
Phi Sigma Kappa (ΦΣΚ), colloquially known as Phi Sig or PSK, is a men's social and academic fraternity with approximately 74 active chapters and provisional chapters in North America. Most of its first two dozen chapters were granted to schools in New England, New York, and Pennsylvania; therefore its early development was strongly Eastern in character, eventually operating chapters at six of the eight Ivy League schools as well as more egalitarian state schools. It later expanded to the South and West. The fraternity has initiated more than 180,000 members since 1873.
According to its Constitution, Phi Sigma Kappa is devoted to the promotion of its three Cardinal Principles: the "Promotion of Brotherhood", the "Stimulation of Scholarship", and the "Development of Character".
Phi Sigma Kappa began on March 15, 1873, at Massachusetts Agricultural College in Amherst (now the University of Massachusetts Amherst) by six sophomores (referred to as The Founders). Phi Sigma Epsilon merged with Phi Sigma Kappa in 1985, which was the largest merger of Greek-letter fraternities.