| Honorific-Prefix: | The Right Honourable |
| The Earl of Durham | |
| Order1: | Lord High Steward |
| Monarch1: | George V |
| Primeminister1: | H. H. Asquith |
| Term Start1: | 9 November 1911 |
| Term End1: | 5 February 1912 |
| Predecessor1: | The Duke of Northumberland |
| Successor1: | The Marquess of Salisbury |
| Birth Date: | 19 June 1855 |
| Nationality: | British |
| Parents: | George Lambton, 2nd Earl of Durham Lady Beatrix Hamilton |
John George Lambton, 3rd Earl of Durham (19 June 1855 – 18 September 1928), known as Viscount Lambton until 1879, was a British hereditary peer.
Durham was the eldest twin son of George Lambton, 2nd Earl of Durham and his wife Lady Beatrix Frances Hamilton, daughter of James Hamilton, 1st Duke of Abercorn. His grandfather was the statesman and colonial administrator, John Lambton, 1st Earl of Durham and his great-grandfather was Prime Minister Charles Grey, 2nd Earl Grey. He inherited the earldom and its subsidiary titles on 27 November 1879 upon the death of his father.
As a young man Durham served as a lieutenant in the Coldstream Guards and later became Honorary Colonel of the Durham Heavy Brigade, Royal Artillery, the 6th Battalion Northumberland Fusiliers and the 8th Battalion Durham Light Infantry, and was awarded the Volunteer Decoration.[1] [2]
Lord Durham visited British India to attend the 1903 Delhi Durbar held in January 1903 to celebrate the succession of King Edward VII as Emperor of India.[3] He was made a Knight Companion of the Garter in 1909 and admitted to the Privy Council in 1911. He bore the Queen Consort's Ivory Rod with Dove at the Coronation of King George V in 1911 and was Lord High Steward to George V during his visit to India from 1911 to 1912.
Lord Durham served as Lord-Lieutenant of County Durham from 1884 to 1928 and from 1919 to 1928 he was Chancellor of the University of Durham.
Lord Durham married Ethel Elizabeth Louisa Milner, daughter of Henry Beilby William Milner, in 1882. The marriage was childless and Lady Durham was committed to a mental institution for most of her adult life. She died in 1931.
In 1892 Lord Durham had a son, John R H Rudge, out of wedlock with the actress and dancer Letitia Elizabeth Rudge, known professionally as Letty Lind, whom he could not marry because his wife's illness prevented a divorce. He and Lind were together for many years until her death in 1923.[4]
Lord Durham died in September 1928, at the age of 73, and was succeeded in the earldom and other titles by his younger twin brother, Frederick.