Louis Montoyer (1749, Mariemont, Austrian Netherlands, now Belgium – 5 June 1811, Vienna) was an 18th-century Belgian-Austrian architect, principally active in Brussels and Vienna.
He worked in Brussels as an architect and building contractor from 1778 onwards. Although he has been credited as the architect of the Royal Castle of Laeken (for Prince Albert of Saxony, Duke of Teschen and his wife Archduchess Maria-Christina), later research made clear he was merely executing the designs of other architects such as Charles de Wailly. In 1795 he came to Vienna with Prince Albert of Saxony, Duke of Teschen, who had already appointed him his court architect in 1780. There he first worked on rebuilding the duke's palace, now known as the Albertina. He also built the Ceremonial Hall at the Hofburg, connecting the Leopoldian part of the building with the old Imperial Palace. Also in Vienna, Montoyer built the Palais Rasumofsky for the former Russian ambassador Andrey Razumovsky.
On 25 September 1805 he was made an honorary citizen of Vienna, and in 1807 he was appointed court architect to Francis II. He was buried in the St. Marx Cemetery, where his memorial can still be seen.
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