Theta Sigma Upsilon () 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.
Theta Sigma Upsilon was founded on March 25, 1921, at Emporia State University. In 1925, the sorority became part of the Association of Education Sororities which it remained a member until the association dissolved when its members became part of the National Panhellenic Conference.
Alpha Gamma Delta absorbed Theta Sigma Upsilon at the 22nd international convention of Alpha Gamma Delta at French Lick, Indiana on June 29, 1959. Thirteen chapters were added to Alpha Gamma Delta from this merger, with these names as their new chapter designations:
Theta Sigma Upsilon's motto was "The Higher Good". Its colors were rose and silver. Its flower was the pink rose. Its trees were the dogwood and the pine. Its jewels were the pearl and turquoise. Its patron goddess was Minerva. Its publication was The Torch.
This is a list of Theta Sigma Upsilon chapters.