The Historical Society of Ottawa (HSO) is Ottawa’s oldest historical organization. It was founded in 1898 by a group of prominent Ottawa women interested in the preservation of Canada’s rich historical heritage at a time when there were few Canadian museums and little government funding for such activities. Initially known as the Women’s Canadian Historical Society of Ottawa, the Society changed its name in 1955 when men were allowed to participate as full members.

The Society’s objective is to preserve and increase public knowledge of the history of Ottawa, including its people and places, through publications, meetings, tours, awards, sponsored research, participation in local heritage events; and to support and encourage heritage conservation.

At monthly meetings, held from September to June, guest speakers inform and engage members in a wide range of topics related to the history of Ottawa and the Ottawa Valley. The monthly meetings are open to the general public.