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.

[2][1] The six founders included Eugenia Tucker Fitzgerald, Elizabeth Williams Mitchell, Sophronia Woodruff Dews, Octavia Andrew Rush, Mary Evans Glass, and Ella Pierce Turner.

In 1904, a committee of three, led by Jewel Davis, contacted Attorney Dupont Guerry, the college's president, about to the procedure to become a national organization.

The deliberations over this change remain largely unknown aside from the impetus of the discovery of a pre-existing men's fraternity using those exact letters and which pre-dated the original Adelphean Society's inception by almost 20 years.

There seems to be little to no speculation as to why "Pi" was specifically chosen as a replacement letter, and or why it took so long to hear of the pre-existing Alpha Delta Phi fraternity.

[4] Thus in 1913, the Adelphean Society, through Convention legislation, changed the name of the organization, adopted a recognition pin, and appointed a standardization committee.

In 1948, Mrs. Carolee Strock Stanard retired as Grand President and part of her keynote address became The Creed of Alpha Delta Pi.

Elizabeth Moseley Coles, who was elected national president at the first grand convention, was responsible for having Alpha Delta Pi's coat of arms designed.

The Adelphean is a quarterly magazine covering recent events, upcoming activities, outstanding members, and chapter news.

[11] Its first issue was published March 12, 1907, by a select group of national Alpha Delta Pi leaders and included a collection of letters from outstanding members and updates on the expansion of the secret society.