John Duncan Gregory CB CMG (26 May 1878 – 29 January 1951) was a British diplomat.
He later became Chargé d'Affaires in Bucharest, was posted to the Holy See in 1915, and was promoted Counsellor in 1919.
While he was cleared of doing anything illegal, he was held by an inquiry to have acted in a manner incompatible with his post and was dismissed from the Diplomatic Service.
Gregory was appointed Companion of the Order of St Michael and St George (CMG) in the 1920 New Year Honours[1] and Companion of the Order of the Bath (CB) in the 1925 Birthday Honours.
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