| Birth Date: | 11 August 1856 |
| Birth Place: | Petergof, Saint Petersburg Governorate, Russian Empire |
| Death Place: | Leningrad, Russian SFSR, Soviet Union |
| Known For: | Architecture |
| Education: |
Leon or Leonty Nikolayevich Benois (Russian: Леонтий Николаевич Бенуа|Leonty Nikolayevich Benua; – 8 February 1928)[1] was a Russian architect from the Benois family.
He was the son of architect Nicholas Benois, the brother of artists Alexandre Benois and Albert Benois. He built the Roman Catholic cathedral of Notre-Dame in St Petersburg, the mausoleum of the Grand Dukes of Russia in the Peter and Paul Fortress, the Russian Chapel in Darmstadt, and the Alexander Nevsky Cathedral, Warsaw, among many other works. Benois served as Dean of the Imperial Academy of Arts (1903–06, 1911–17) and edited the architecture magazine Zodchii. He gave his name to Leonardo da Vinci's painting Benois Madonna which he inherited from his father-in-law and presented to the Hermitage Museum. The painter Nadia Benois was his daughter,[2] and the actor Sir Peter Ustinov was his grandson.