John A. Sinclair

John A. Sinclair may refer to:

John Alexander Sinclair, head of the British Secret Intelligence Service from 1953 to 1956.
John A. Sinclair, British World War 2 airforce gunner, recipient of the George Medal
John A. Sinclair, a member of the Canadian Curling Hall of Fame
John Archibald Sinclair, a mayor of Halifax, Nova Scotia

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