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.
Alpha Gamma Delta absorbed Theta Sigma Upsilon at the 22nd international convention of Alpha Gamma Delta at French Lick, Indiana on June 29, 1959.[4] Thirteen chapters were added to Alpha Gamma Delta from this merger, with these names as their new ΑΓΔ chapter designations:[5]
Theta Sigma Upsilon's colors were rose and silver.[6] Its flower was the pink rose.[6] Its trees were the dogwood and the pine.[6] Its jewels were the pearl and turquoise. Its patron goddesss was Minerva.[6] Its publication was The Torch.[6]
^Chapter formed from Beta Theta (local), established in 1924. It withdrew and became Theta Sigma Tau (local), which later became the Beta Zeta chapter of Gamma Phi t Beta.
^Chapter formed from Nu Lambda Sigma (local), established in 1924.
^This chapter can trace its origin to the Order of the Eastern Star Club, formed in 1922. That club formed a local sorority called Aleph Lamedh Tav in 1923. In 1927, it adopted became the local sorority named "Alpha Tau Lambda", which formed the Theat Sigam Upsilon chapter. It became the Epsilon Iota chapter of Alpha Gamma Delta with the national merger of the two sororities.
^Chapter formed from Beta Phi Zeta (local), established in 1927. It became the Gamma Kappa chapter of Alpha Gamma Delta.
^Chapter formed from Sigma Upsilon (local), established in 1927. It withdrew in 1931 to become Delta Kappa (local), which merged with the small national Lambda Omega, which in turn merged with Theta Upsilon in September 1933. It was dormant between 1940–1946, re-established, and then went dormant again in 1952. Theta Upsilon would itself merge nationally with Delta Zeta in 1962.
^Chapter originated in 1921 as the Eastern Star Club (local) which became the Beta chapter of Epsilon Sigma in 1925. In 1927, it became a local named Zeta Sigma Phi, before joining Theta Sigma Upsilon. It became the Epsilon Mu chapter of Alpha Gamma Delta with the national merger of the two sororities.
^Chapter originated as the Alpha chapter of Omega Epsilon Sigma in 1925. Before merging with ΘΣΥ it briefly became Omega Sigma (local). It became the Epsilon Lambda chapter of Alpha Gamma Delta with the national merger of the two fraternities.
^The chapter formed as a colony in 1928, closing five years later. Fraternities and sororities no longer exist on the Western Colorado campus.
^Chapter formed from Delta Sigma local, established in 1924. It became the Delta Iota chapter of Alpha Gamma Delta.
^Chapter formed from Theta Sigma (local), established in 1935. It became the Alpha Sigma chapter of Alpha Gamma Delta.
^Chapter formed from Theta Sigma (local), established in 1935. It became the Beta Theta chapter of Alpha Gamma Delta.
^Chapter formed from Phi Gamma Psi (local), established in 1928.
^Chapter formed from Delta Theta Alpha (local), established in 19336. It became the Gamma Lambda chapter of Alpha Gamma Delta.
^Chapter formed from Zet Chi Delta (local), established in 1941. It became the Alpha Upsilon chapter of Alpha Gamma Delta.
^Became the Gamma Mu chapter of Alpha Gamma Delta.
^Chapter formed from Pi Sigma Gamma (local), established in 1934.
^Became the Alpha Tau chapter of Alpha Gamma Delta.
Former and formerly active members of the Professional Fraternity Association or its predecessors: Professional Panhellenic Association or Professional Interfraternity Conference