| Honorific-Prefix: | The Most Honourable |
| The Marquess of Milford Haven | |
| Predecessor: | David Mountbatten, 3rd Marquess of Milford Haven |
| Heir: | Henry Mountbatten, Earl of Medina |
| Marquess of Milford Haven | |
| Other Titles: | Earl of Medina (1961–1970) |
| Birth Name: | George Ivar Louis Mountbatten |
| Birth Date: | 6 June 1961 |
| Spouse: | |
| Issue: | Lady Tatiana Mountbatten Henry Mountbatten, Earl of Medina |
| Parents: | David Mountbatten, 3rd Marquess of Milford Haven Janet Mercedes Bryce |
George Ivar Louis Mountbatten, 4th Marquess of Milford Haven (born 6 June 1961), styled Earl of Medina before 1970, is a British hereditary peer and businessman.
Lord Milford Haven is the elder son of the 3rd Marquess of Milford Haven and Janet Mercedes Bryce, the older brother of Lord Ivar Mountbatten and a descendant of Queen Victoria, Catherine the Great, Alexander Pushkin, and Abram Gannibal. At the death of his father on 14 April 1970, he became the 4th Marquess of Milford Haven and head of the House of Mountbatten. He is second cousin to Charles III through both of their fathers.
Lord Milford Haven married first Sarah Georgina Walker (born London, Middlesex, 17 November 1961/2), in London on 8 March 1989. She is the daughter of George Alfred Walker and Jean Maureen (née Hatton), and the former wife of Andreas Antoniou (married 1985; divorced 1987). Lord Milford Haven and Walker had two children:
The couple were divorced on 27 February 1996 and she married in June 2016 Michael Spencer, Lord Spencer of Alresford.
Lord Milford Haven subsequently married Clare Husted Steel (born Manhattan, New York, New York County, New York, 2 September 1960) at Coatue Point, Nantucket, Nantucket County, Massachusetts, on 20 August 1997, without issue.
In 2000, he founded uSwitch, a website which helps consumers compare and change suppliers of various services. The company was sold to the American media firm E. W. Scripps in March 2006 for around £210 million ($400 million).[2]
He plays polo, and Julian Hipwood has coached his teams.[3] He won the Queen's Cup with the Broncos team in 1988 and reached the 2006 final.[4]
| Crest: | 1st: Out of a Coronet Or two Horns barry of ten Argent and Gules issuing from each three Linden Leaves Vert and from the outer side of each horn four Branches barwise having three like Leaves pendent therefrom of the last (Hesse); 2nd: Out of a Coronet Or a Plume of four Ostrich Feathers alternately Argent and Sable (Battenberg) |
| Coronet: | A Coronet of a Marquess |
| Escutcheon: | Quarterly: 1st and 4th, Azure a Lion rampant double-queued barry of ten Argent and Gules armed and langued of the last crowned Or within a Bordure company of the second and third (Hesse); 2nd and 3rd, Argent two Pallets Sable (Battenberg); charged on the honour point with an Escutcheon of the arms of the late Princess Alice, namely: the Royal Arms differenced by a Label of three points Argent the centre point charged with a Rose Gules barbed Vert and each of the other points with an Ermine Spot Sable |
| Supporters: | On either side a Lion double-queued and crowned all Or |
| Motto: | In Honour Bound |