John Hugh MacMillan Jr. (1895 – December 23, 1960) was an American businessman, president of Cargill from 1936 to 1960.
After graduating Yale he entered the United States Army artillery, rising to the rank of Major when he was 23.
After the war, he worked as a trader on the floor of the Minneapolis Chamber of Commerce for Cargill, the family grain business.
He invested in the United States and expanded Cargill's operations into Europe and South America.
They had children:[1] MacMillan died on December 23, 1960, and is buried at Lakewood Cemetery, Minneapolis.