Alpha Delta Pi (ΑΔΠ), commonly known as ADPi (pronounced "ay-dee-pye"), is an International Panhellenic sorority founded on May 15, 1851, at Wesleyan College in Macon, Georgia. It is the oldest secret society for women. Alpha Delta Pi is a member of the National Panhellenic Conference, which is the governing council of its 26 member sororities. The sorority's national philanthropic partner is the Ronald McDonald House Charities. Its Executive Office is located in Atlanta, Georgia.