John Meagher (c. 1805 – March 11, 1876) was an Irish-born merchant and political figure in Canada East. He represented Bonaventure in the Legislative Assembly of the Province of Canada from 1854 to 1861 as a Reformer.

He established himself in the timber trade at Carleton. Meagher was lieutenant-colonel in the local militia. He married Mary Ann Drake. Meagher ran unsuccessfully for a seat in the assembly in 1848. He was defeated when he ran for reelection in 1861. Meagher died at Carleton.

• "Biography". Dictionnaire des parlementaires du Québec de 1792 à nos jours (in French). National Assembly of Quebec.