Theta Delta Sigma Society, Inc. (ΘΔΣ) is a national fraternal organization that emphasizes the four pillars of Leadership, Diversity, Unity, and Respect. Founded in 2001 by fourteen undergraduate men and women at the University at Buffalo (SUNY), Theta Delta Sigma has been a partner in the values-based fraternal movement. Theta Delta Sigma is a non-partisan and non-sectarian organization that declares membership to be open without regard to ability, race, creed, faith, nationality, gender identity and/or expression, sexual orientation, socio-economic status, or veteran status.