L'assassinat du grand-duc Serge, is a 1905 French silent short film directed by Lucien Nonguet, and distributed in English-speaking countries under the titles Assassination of the Grand Duke Serge and Assassination of the King of Serbia. The film is a docudrama dramatising the re-enactment of the assassination of Grand Duke Sergei Alexandrovich of Russia that had taken place a few months before in Moscow.