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The Sigma Phi Society ( ΣΦ) is an American college fraternity. Established in 1827 at Union College in Schenectady, New York, it was the second Greek letter fraternal organization founded in the United States. Sigma Phi was the first collegiate social fraternity to establish a chapter at another college, making it the first national fraternity. It was also a founding member of the National Interfraternity Conference, now the North American Interfraternity Conference. It is part of the Union Triad.
The Alpha chapter of Sigma Phi at Union College has been in continuous operation since its founding, making it the oldest continuously running fraternity chapter in the United States. In 1831, Beta of New York was established at Hamilton College, making the society the first Greek fraternal organization in the United States to establish a chapter at another college, thus becoming the first national Greek letter organization in the United States.Robson, John, ed. (1963). Baird's Manual of American College Fraternities (17th ed.). Menasha, Wisconsin: The Collegiate Press, George Banta Company, Inc., pp. 8 and 325
In 1834, Sigma Phi became the first fraternity to publish a catalogue of its membership. The fraternity was incorporated in the State of New York in 1885 and was reincorporated in 1920.
In 1901, Sigma Phi became a founding member of the National Interfraternity Conference, now the North American Interfraternity Conference.Robson, John, ed. (1963). Baird's Manual of American College Fraternities (17th ed.). Menasha, Wisconsin: The Collegiate Press, George Banta Company, Inc. pp. 34.
Historically, the fraternity had been conservative in adding chapters. In 1963, the fraternity had eleven active chapters, two inactive chapters, and 3,910 living members.
Its headquarters is in Tucson, Arizona.
The Sigma Phi badge is a monogram with a jeweled Σ directly over a Φ that is either plain or chased. It was designed by Charles N. Rowley, founder of the Beta of New York chapter. In 1879, Baird's Manual of American College Fraternities stated that the badge was royal purple. Since 1879, the badge has been produced mainly in gold. Its pledge pin is a light blue and white button.
The society's colors are azure and argent (light blue and white). Its motto is Esto Perpetua or "Let it be perpetual". Its publication is the Sigma Phi Flame, first published in 1920 .
| Alpha of New York | U | Union College | Schenectady, New York | Active | ||
| Beta of New York | H | 1831–2019 | Hamilton College | Clinton, New York | Inactive | |
| Alpha of Massachusetts | W | 1834–1968 | Williams College | Williamstown, Massachusetts | Inactive | |
| Gamma of New York | N | – | New York University | New York City, New York | Inactive | |
| Delta of New York | G | Hobart College | Geneva, New York | Active | ||
| Alpha of Vermont | V | University of Vermont | Burlington, Vermont | Active | ||
| Alpha of New Jersey | P | 1853–1858 | Princeton University | Princeton, New Jersey | Inactive | |
| Alpha of Michigan | M | 1858–2022 | University of Michigan | Ann Arbor, Michigan | Inactive | |
| Alpha of Pennsylvania | L | – 2002 | Lehigh University | Bethlehem, Pennsylvania | Inactive | |
| Epsilon of New York | C | Cornell University | Ithaca, New York | Active | ||
| Alpha of Wisconsin | F | University of Wisconsin–Madison | Madison, Wisconsin | Active | ||
| Alpha of California | I | University of California, Berkeley | Berkeley, California | Active | ||
| Alpha of Virginia | S | 1953 | University of Virginia | Charlottesville, Virginia | Active | |
| Alpha of North Carolina | T | 2008–2019 | University of North Carolina at Chapel Hill | Chapel Hill, North Carolina | Inactive |
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