Napoléon Rioux (February 13, 1837 – September 15, 1899) was a seigneur, merchant and political figure in Quebec.
He represented Témiscouata in the Legislative Assembly of Quebec from 1892 to 1897 as a Conservative.
He was born in Trois-Pistoles, Lower Canada, the son of Jean-Baptiste Rioux and Marcelline Chamberland, and was educated there.
He owned the seigneury of Anse-aux-Coques.
Rioux was a justice of the peace.
In 1862, he married Philomène Martin.
He helped found a colonization society at Trois-Pistoles in 1869.
Rioux founded the local Saint-Jean-Baptiste Society in 1876 and also served as its president.
He ran unsuccessfully for a seat in the Quebec assembly in 1890, losing to Charles-Eugène Pouliot, then defeated Pouliot to win the seat in 1892.
Rioux was defeated by Félix-Alonzo Talbot when he ran for reelection in 1897.
He died two years later in Trois-Pistoles at the age of 62.