Eldon Pattyson (Pat) Black (15 October 1925 – 3 November 1999) was a Canadian diplomat.Black was educated at Selwyn House School and studied law at McGill University.In 1967, Black was appointed minister (second-in-command) to the Embassy of Canada in France.
Years later, in 1996, Black would publish a book titled Direct Intervention: Canada-France Relations, 1967-1974 (ISBN 0886292891).
Graham Fraser, in a review published in the International Journal, praised it as "a valuable account, clear and detailed in its description of the challenge Canadian diplomats faced in dealing, day-to-day, with an ally whose government had taken a decisively hostile position on the central question of Canada's future."Black returned to Canada where he took a position as a Department of External Affairs Foreign Service Officer working in foreign intelligence.
In 1978 Don Jamieson, Minister of External Affairs, asked Black to fill a new deputy under-secretary position in his department to deal with the increasing threat of terrorism.In 1985 he was appointed as Ambassador Extraordinary and Plenipotentiary to the Holy See.