- Chambon Foundation
 - Committed to exploring and communicating, especially in documentaries, the necessary lessons of hope intertwined with the Holocaust's unavoidable lessons of despair. - Chinese Historical Society of Southern California
- Co. G 3rd Regiment Georgia Volunteer Infantry
- Civil War reenacting group.
- Electric Railway Historical Association
- History of the electric street railways and the horse and cable car systems of Southern California.
- Hancock Park Historic Preservation Advocacy Group
- Promoting the establishment of a historic preservation overlay zone for the neighbourhood Melrose to Wilshire and Highland to Rossmore.
- Highland Park Heritage Trust
- Dedicated to the preservation of Los Angeles¿ Arroyo Seco communities of Highland Park, Garvanza, Mt. Washington, Hermon, and Montecito Heights.
- Los Angeles Conservancy
- Offering information on Los Angeles architecture, historic preservation, walking tours, volunteer opportunities and the Last Remaining Seats series.
- Los Angeles Conservancy Modern Committee
- Preservation group dedicated to the recognition, preservation, and revitalization of the historic architectural resources of greater Los Angeles.
- Los Angeles GRIM Society
- Nonprofit association of otherwise normal individuals who share the same morbid curiosity about the less savory aspects of the history of the city of Los Angeles.
- Ninth and Tenth (Horse) Cavalry Association
- Commemorating the service of the Buffalo Soldiers from 1866 to 1944. Includes history, calendar, and reenactment information.
- St. Ives Historical Society
- Not-for-profit organisation of Renaissance reenactors and educators, based out of Southern California.
- St. Vincent Medical Center Historical Conservancy
- Preserving the history of Los Angeles and its oldest hospital.
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