Count Alexander Konstantin Albrecht von Mensdorff-Pouilly, 1st Prince von Dietrichstein zu Nikolsburg (German: Alexander Konstantin Albrecht Graf von Mensdorff-Pouilly, 1. Fürst 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 cousin of Queen Victoria of the United Kingdom of Great Britain and Ireland.

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Quick Facts His Serene HighnessFürst von Dietrichstein zu Nikolsburg, 4th Chairman of the Austrian Ministers' Conference ...

His Serene Highness Alexander Graf von Mensdorff-Pouilly Fürst von Dietrichstein zu Nikolsburg
Portrait by Friedrich von Amerling
4th Chairman of the Austrian Ministers' Conference
In office 26 June 1865 – 27 July 1865
Monarch	Francis Joseph I
Preceded by	Erzherzog Rainer Ferdinand von Österreich
Succeeded by	Richard Graf von Belcredi
8th Foreign Minister of the Austrian Empire
In office 27 October 1864 – 30 October 1866
Preceded by	Johann Bernhard Graf von Rechberg und Rothenlöwen
Succeeded by	Friedrich Ferdinand Graf von Beust
Personal details
Born	Alexander Konstantin Albrecht Graf von Mensdorff-Pouilly (1813-08-04)4 August 1813 Coburg
Died	14 February 1871(1871-02-14) (aged 57)
Spouse	Alexandrine von Dietrichstein
Children	Hugo, 2nd Prince von Dietrichstein zu Nikolsburg Count Albert von Mensdorff-Pouilly-Dietrichstein
Parent(s)	Count Emmanuel von Mensdorff-Pouilly Princess Sophie of Saxe-Coburg-Saalfeld

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He was born as a son of Princess Sophie of Saxe-Coburg-Saalfeld and Count Emmanuel von Mensdorff-Pouilly, a member of the House of Mensdorff-Pouilly. He entered the Austrian army in 1829, and he was promoted to captain in 1836 and major in 1844. In 1848–49, he fought in the First Italian War of Independence and against the Hungarian Revolution of 1848. In 1849, he was promoted to colonel and the following year to major general.

In 1851, Mensdorff-Pouilly was appointed as the Austrian commissioner to Schleswig-Holstein. In 1852, he became the Austrian ambassador to Russia. He was promoted to Feldmarschallleutnant in 1858. During the Polish Uprising of 1863, he served as the governor of Austrian Galicia.

He married Alexandrine "Aline" von Dietrichstein (1824–1906), a daughter of Joseph, 9th Prince of Dietrichstein (1798–1858), with whom he had children:

• Marie Gabriele von Mensdorff-Pouilly-Dietrichstein (1858–1889)
• Hugo, 2nd Prince von Dietrichstein zu Nikolsburg (1858–1920), married Princess Olga Alexandrovna Dolgorukova (1873 - 1946) in 1892
• Count Albert von Mensdorff-Pouilly-Dietrichstein
• Clotilde von Mensdorff-Pouilly-Dietrichstein, married Count Albert Apponyi in 1897