Louis Alexander Mountbatten, 1st Marquess of Milford Haven, formerly Prince Louis Alexander of Battenberg, was a British naval officer and German prince related by marriage to the British royal family.

Captain George Louis Victor Henry Serge Mountbatten, 2nd Marquess of Milford Haven, born Prince George of Battenberg, styled Earl of Medina between 1917 and 1921, was a Royal Navy officer and the elder son of Louis Mountbatten, 1st Marquess of Milford Haven, and Princess Victoria of Hesse and by Rhine.