Stephen Jones Chamberlin (23 December 1889 – 23 October 1971) was a lieutenant general in the United States Army who served during World War II as General of the Army Douglas MacArthur's Assistant Chief of Staff, G-3, the staff officer in charge of plans and operations. Born in Spring Hill, Kansas on 23 December 1889, he was a 1912 graduate of the United States Military Academy at West Point, New York. During World War I, he was aide-de-camp to Major General David C. Shanks, the New York Port of Embarkation commander at Hoboken, New Jersey, for which he was one of twelve Army officers who received the Navy Cross.