Arnold Danford Patrick Heeney CC QC (April 5, 1902 – December 20, 1970) was a Canadian lawyer, diplomat and civil servant.

As the Manitoba Rhodes Scholar he went on to St. John's College, Oxford before returning to Canada, earning a Bachelor of Civil Law degree at McGill University.

In 1938, he took the position of Principal Secretary to Prime Minister William Lyon Mackenzie King.

[citation needed] In 1949, he became Under Secretary of State for External Affairs, then Ambassador to the North Atlantic Treaty Organization.

This biography of a person who has held a non-elected position in the Government of Canada is a stub.