The Tri-History Conference is co-sponsored by three historical organizations of the Episcopal Church. It is held every three years at a different location and examines the particular heritage of the Episcopal Church, its antecedents and the other churches of the Anglican Communion. The three co-sponsoring organizations are:

• Episcopal Women's History Project (EWHP)
  
• Historical Society of the Episcopal Church (HSEC)
  
• National Episcopal Historians and Archivists (NEHA)