W. Lafontaine (10 July 1796 in Moscow – 1859 in the 10th arrondissement of Paris) was a 19th-century French playwright.
Born in the Russian Empire, he came to France in 1802 or 1803 with his father and two brothers.
After he returned to civilian life, he lived in Paris at 9 Rue du Helder when he married Antoinette Marie Laurentine Almaïde Arnoult de Sartrouville on 18 November 1820.
He later became commissaire de police in Paris and lived at 7 rue des Carmelites.
Whereas he thought he was exempted to apply for naturalization (since he was married to a French woman and father of five children born in France, and having lived thirty years in France), he must apply to be naturalized French on 28 December 1835 because, at the time, if born abroad, even from French parents, people had to be naturalized to have French nationality and be employed at the service of the State.