Jean-Baptiste Kelly (5 October 1783 – 24 February 1854) was a Québécois Roman Catholic vicar-general of Irish ancestry who was active in Lower Canada.
Kelly's success had humble beginnings. He was born in Quebec City, Quebec, to a carter, John Kelly, and Marguerite Migneron. If Joseph-Octave Plessis had not encountered him on the street and sent him to primary school, Kelly might have lived an unremarkable life. As it happened, Kelly, after that schooling, and reaching the age of 14, was sent to the Petit Séminaire de Québec, where his "very great application in all things" could be demonstrated. Elected prefect of the Congrégation de la Bienheureuse-Vierge-Marie-Immaculée in 1802, Kelly was assisted by Jacques Labrie and future Lower Canada Rebellion leader Louis-Joseph Papineau.
Plessis had also furthered his own career, becoming coadjutor bishop of Quebec. In 1803, Kelly had a chance to repay Plessis' investment in him, becoming Plessis' assistant secretary. Two years later, when Plessis was made bishop, Kelly served as diocesan secretary. The next year, 1806, Kelly left his mentor, and Quebec City, to work under François Cherrier, Vicar General at Saint-Denis, a town south of Montreal (and, coincidentally, where Kelly's former assistant Papineau would win a major Rebel victory three decades later). Cherrier was also impressed by Kelly, describing him as "his charming lieutenant vicar". On 9 November 1806, Plessis ordained his protegée as a full Catholic priest.