The Permanent Joint Board on Defense (French: Commission permanente mixte de défense Canada-États-Unis, spelled Defence in Canadian English) is the senior advisory body on continental military defence of North America.

The board was established by Canada and the United States on August 17, 1940 under the Ogdensburg Agreement, signed by President Franklin D. Roosevelt and Prime Minister William Lyon Mackenzie King at Ogdensburg, New York.

The main purpose of the group is to provide policy-level consultation on bilateral defence matters.

Periodically the board conducts studies and reports to the governments of the United States and Canada.

Such bodies' success likely influenced the design of the Permanent Joint Board on Defense.