Delta Zeta (ΔΖ, also known as DZ) is an international college sorority founded on October 24, 1902, at Miami University in Oxford, Ohio.

As of 2013, there are over 300,400 college and alumnae members, making it the third largest sorority in the nation (after Alpha Delta Pi and Chi Omega).

[1] Six of the newly admitted women consulted the university president Guy Potter Benton, regarding the founding of the first sorority chapter.

[7][8][1] In 1992, Delta Zeta chartered its first Canadian chapter at the University of Windsor, marking the beginning of the sorority's international expansion.

[5] The National Council of Delta Zeta is an alumnae board tasked with the governance of the organization.

[13] The Delta Zeta Foundation is a not-for-profit entity within the organization that provides various scholarships for members of the sorority as well as funding leadership, philanthropy, and education programs.

[35] The Delta Zeta national leadership was criticized after The New York Times published an article accusing the national office of moving certain members of the Delta chapter at DePauw University to alumnae status based on their perceived attractiveness.

Despite its long history at DePauw, the chapter struggled with declining membership and had acquired a negative reputation on campus.