John Sheffield, 1st Duke of Buckingham and Normanby, English poet and politician, Lord President of the Council (died 1721)

John Sheffield, 1st Duke of Buckingham and Normanby was a British military officer, writer and Tory politician who served as Lord Privy Seal and Lord President of the Council. He was also known by his original title, Lord Mulgrave.

The Lord President of the Council is the presiding officer of the Privy Council of the United Kingdom and the fourth of the Great Officers of State, ranking below the Lord High Treasurer but above the Lord Keeper of the Privy Seal. The Lord President usually attends and is responsible for chairing the meetings of the Privy Council, presenting business for the approval of the Sovereign.