|Marquessate of Milford Haven|
|Creation date||7 November 1917|
|Created by||King George V|
|Peerage||Peerage of the United Kingdom|
|First holder||Prince Louis of Battenberg|
|Present holder||George Mountbatten, 4th Marquess|
|Heir apparent||Henry Mountbatten, Earl of Medina|
|Remainder to||the 1st Marquess's heirs male of the body lawfully begotten|
|Subsidiary titles||Earl of Medina|
|Motto||IN HONOUR BOUND|
Marquess of Milford Haven is a title in the Peerage of the United Kingdom.
The marquessate of Milford Haven was created in 1917 for Prince Louis of Battenberg, the former First Sea Lord, and a relation by marriage to the British Royal family, who amidst the anti-German sentiments of the First World War abandoned the use of his German surname and titles and adopted the surname Mountbatten, an Anglicized version of the surname Battenberg. He was at the same time made Earl of Medina and Viscount Alderney, also in the Peerage of the United Kingdom.  The title honors the Welsh seaport and shipyard town of Milford Haven.
As of 2016 [update], the titles are held by his great-grandson, the fourth Marquess, who succeeded his father in 1970.
The family lived at Lynden Manor at Holyport, Berkshire, now split into four houses. A later seat was Moyns Park in Birdbrook, Essex. The 1st and 3rd Marquess of Milford Haven are buried at St. Mildred's Church, Whippingham; the 2nd Marquess is buried in Bray Cemetery, Bray, Berkshire.
The heir apparent is the present holder's son Henry David Louis Mountbatten, Earl of Medina (b. 1991)
This article needs additional citations for verification. (June 2016)