John Russell, 6th Duke of Bedford

His Grace The Duke of Bedford KG PC FSA
Portrait of John Russell, 6th Duke of Bedford by Sir George Hayter in 1835
Lord Lieutenant of Ireland
In office 12 March 1806 – 11 April 1807
Monarch	George III
Prime Minister	The Lord Grenville
Preceded by	The Earl of Powis
Succeeded by	The Duke of Richmond

John Russell, 6th Duke of Bedford KG PC FSA (6 July 1766 – 20 October 1839), known as Lord John Russell until 1802, was a British Whig politician who notably served as Lord Lieutenant of Ireland in the Ministry of All the Talents. He was the father of Prime Minister John Russell, 1st Earl Russell.

Bedford was a younger son of , eldest son and heir of John Russell, 4th Duke of Bedford. His mother was Lady Elizabeth, youngest child of Willem van Keppel, 2nd Earl of Albemarle and Lady Anne Lennox.

Like most Russells, Bedford was a Whig in politics. He sat as Member of Parliament for from 1788 to June 1790 and from December 1790 to 1802, when he was elevated to the Upper House on the death of his father. He served as Lord Lieutenant of Ireland during the Whig government of 1806–1807. He became, as did many of his party who were strong followers of Bonapartism, opposed to the Peninsular War, believing that it neither could nor should be won. He funded, along with his son, many anti-war publications. Bedford was sworn of the Privy Council in 1806 and appointed a Knight of the Garter in 1830.

Bedford married firstly the Hon. Georgiana Byng, daughter of George Byng, 4th Viscount Torrington, in 1786. The marriage lasted 15 years and they had three sons: