1914 – Omicron Delta Kappa founded at Washington and Lee University, December 3, 1914, as a fraternity; first National President elected and served to 1920
1917 – Establishment of General Council to govern the organization of three circles
1920 – First national convention held at Johns Hopkins University; creation of the position of General Secretary (volunteer position)
1925 – Creation of the position of Executive Secretary, fulfilling duties of General Secretary, National Treasurer, Extension Secretary, and Publicity Secretary
1929 – First scholarship campaign for a single scholarship
1940 – Omicron Delta Kappa begins to identify as a society instead of a fraternity
1974 – Women admitted to membership
1981 – Maurice A. Clay named first full-time Executive Director (professional position)
1982 – Creation of the Omicron Delta Kappa Foundation, incorporated in Florida in 1984; Foundation Board of Trustees establishing as the governing body for the Foundation
Late 1980s/Early 1990s – Transition from General Council to Executive Council to Society Board of Directors model to govern the Omicron Delta Kappa Society
1992 – Omicron Delta Kappa Society incorporated in Kentucky
2000 – Convention delegates approve a province governance structure that provided geographic representation of advisors and collegiate members at the national and regional level
2002 – Convention delegates approve province realignment
2006 – Convention delegates vote to move from the previous province structure to a regional structure with four regions represented
2010 – Creation of the National Advisory Council and elimination of regional structure as related to the governance of the Society; a permanent National Headquarters is established in Lexington, Virginia.
2019 – A National Conclave votes to merge the Society and Foundations into a single organization – the Omicron Delta Kappa Society and Educational Foundation, Inc.