 Alexander von Mensdorff-Pouilly, Prince von Dietrichstein zu Nikolsburg

Count Alexander Konstantin Albrecht von Mensdorff-Pouilly, 1st Prince von Dietrichstein zu Nikolsburg (; 4 August 1813 in Coburg – 14 February 1871) was an Austrian general, diplomat and politician, including two years as Minister of Foreign Affairs (1864–66) and one month's service as Minister-President of Austria.He was a first cousin of Queen Victoria of the United Kingdom of Great Britain and Ireland, as their mothers were sisters.