Albert Viktor Julius Joseph Michael Graf von Mensdorff-Pouilly-Dietrichstein (5 September 1861 – 15 June 1945) was an Austro-Hungarian diplomat who served as Ambassador to London at the outbreak of World War I.

[1] Count von Mensdorff-Pouilly-Dietrichstein entered the Austro-Hungarian foreign service in 1884 and was assigned as an attaché to the embassy in Paris and transferred to London in 1889.

On 6 May 1904, he presented his credentials as Ambassador of the Dual Monarchy at the Court of St. James's, a promotion over the heads of many of his seniors that had come at the request of his second cousin King Edward VII of the United Kingdom.

In the critical negotiations during the July Crisis of 1914, he supported the attempts to avert the danger and correspondence has shown that he was not kept fully informed of his capital's intentions.

[5] In 1917, Mensdorff-Pouilly was appointed to the Upper House (Herrenhaus)[6] and in the following year he was a favourite of the court to replace Count Ottokar Czernin as foreign minister, but he was judged too Anglophile by Berlin.