Alexander Albert Mountbatten, 1st Marquess of Carisbrooke (born Prince Alexander Albert of Battenberg; 23 November 1886 – 23 February 1960) was a British Royal Navy officer, a member of the Hessian princely Battenberg family and the last surviving grandson of Queen Victoria.

His mother was Princess Beatrice of the United Kingdom, the fifth daughter and the youngest child of Queen Victoria and Prince Albert.

However, three weeks after his birth, on 13 December 1886, he was styled His Highness under a Royal Warrant passed by his grandmother Queen Victoria.

[7] In 1909, he joined the British Army, being appointed Second Lieutenant (on probation) in the Grenadier Guards on 4 August 1909.

On 1 June 1917, he was authorised to wear the insignia of the Russian Order of St Vladimir, fourth class with Swords, awarded "for distinguished service to the Allied cause.

During World War II, despite being in his mid-fifties, the Marquess joined the Royal Air Force and was commissioned an acting pilot officer on 6 June 1941.

According to the published diaries of Cecil Beaton, in his later years, Lord Carisbrooke had a longtime male lover, Simon Fleet.

[19] Lord Carisbrooke, died in 1960, aged 73, at Kensington Palace, and his ashes were buried within the Battenberg Chapel in St. Mildred's Church, Whippingham on the Isle of Wight.