John G. Diefenbaker Building

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John G. Diefenbaker Building
The original 1958 portion (right) and the 1994 expansion (left) of the building on as seen from Sussex Drive over the Rideau River.
Former names	Ottawa City Hall (1958–2001)
Alternative names	Old City Hall
General information
Type	Office building
Architectural style	Modern, International
Location	Ottawa, Ontario, Canada
Address	111 Sussex Drive
Town or city	Ottawa
Country	Canada
Current tenants	Global Affairs Canada
Named for	John G. Diefenbaker
Construction started	1956
Completed	1958
Renovated	1988–1994
Design and construction
Architect(s)	John Bland (original 1958 building) Moshe Safdie (1994 expansion)

The John G. Diefenbaker Building is a building in the New Edinburgh neighbourhood of Ottawa, Ontario. The building served as Ottawa's city hall from August 2, 1958, to January 1, 2001, and afterward was commonly known as Old City Hall. Purchased in 2003 by the Government of Canada, it was known by its municipal address, 111 Sussex Drive, until September 2011 when it was renamed after Canada's 13th prime minister, John Diefenbaker.^[1] The building is located on Green Island where the Rideau River empties into the Ottawa River.