| Olivier-Napoléon Drouin | |
| Order: | Alderman of Quebec City, Saint-Roch ward |
| Term Start: | 1896 |
| Term End: | 1910 |
| Order2: | 26th Mayor of Quebec City |
| Term Start2: | 1 March 1910 |
| Term End2: | 1 March 1916 |
| Predecessor2: | Jean-Georges Garneau |
| Successor2: | Henri-Edgar Lavigueur |
| Profession: | tobacco producer |
Olivier-Napoléon Drouin (1862–1934) was a Canadian politician, the mayor of Quebec City from 1910 to 1916. He also initiated the Rock City Tobacco company.
After representing Quebec City's Saint-Roch ward as alderman since 1896, Drouin won the 1910 mayoralty contest with a 1328 vote margin over his opponent, federal politician Philippe-Auguste Choquette. Drouin won re-election to successive terms in office in 1912 and 1914. During his terms as mayor, he oversaw the annexation of the communities of Belvedère, Limoilou and Saint-Malo to Quebec City.
After leaving the mayor's posting in 1916, Drouin chaired the Commission des chemins du Québec (Commission of routes of Quebec) between 1917 and 1922.