Sigma Delta Tau (ΣΔΤ) is an American sorority and member of the National Panhellenic Conference.

[2] Sigma Delta Tau was founded on March 25, 1917 at Cornell University by seven Jewish women: Dora Bloom Turteltaub, Amy Apfel Tishman, Marian Gerber Greenberg, Grace Srenco Grossman, Inez Dane Ross, Regene Freund Cohane and Lenore Rubinow.

[1] Prevent Child Abuse America was selected as Sigma Delta Tau's National Philanthropy in 1982.

Each Sigma Delta Tau chapter conducts an annual service project, educational program or major fund raiser for the benefit of Prevent Child Abuse America.

Sigma Delta Tau currently has a total of 64 active collegiate chapters across North America.