Omicron Delta Kappa (ΟΔΚ), also known as The Circle and ODK, is an American collegiate honor society that recognized leadership and scholarship.

On December 3, 1914, the Omicron Delta Kappa Society was founded by fifteen men who met in an office on the third floor of Reid Hall at Washington and Lee University.

The student newspaper, Ring-Tum Phi, broke the news on January 12, 1915, of a new society to be known as "The Circle," with the secret significance of its three Greek letters known only to its members.

[6] In June 1972, Title IX prohibited sex discrimination in federally assisted educational programs and amended parts of the Civil Rights Act of 1964.

Omicron Delta Kappa's special committee on the possible role of women met in January 1973 and recommended changes to the national constitution that would abolish segregation based on gender.

[6] The first women members were initiated that day, including Carolyn Julia Kucinski, and Diane Christine Ragosa of the Newark College of Engineering circle and Robbie Lynn Cooney, Maria Dolores Delvalle, Roxane R. Dow, Catherine Ann Rohrbacher, Karen Diane Janzer, Linda Ann Touten, Martha Gwyn Van Deman, and Cathy Sue Welch of the University of South Florida circle.

[8] The Greek letters ΟΔΚ stand for the motto Ho Daph-no’-ko-mos Kük’-los or "The Laurel Crowned Circle".

[9] Omicron Delta Kappa's emblem is the Laurel Crowned Circle, representing the successes achieved through worthy undertakings.

[1][3] The five stars represent the five major phases of college life—athletics, campus or community service, communications, creative and performing arts, and scholarship.

[10] Potential members are also evaluated based on athletics; campus and community service; university communication such as journalism and speech; and the creative and performing arts.

[10][12][2] The society also selects faculty and alumni members based on character, achievement in college and community life, and consecration to democratic ideals.