Thomas-Jacques Taschereau (French pronunciation: [tɔma ʒak taʃʁo]; August 26, 1680 – September 25, 1749) was the patriarch of the illustrious Taschereau family in New France (Canada).
It is believed that he may have come from some level of nobility in France and his family descended from a line of royal municipal officials.
It was then that his most important contribution to the Taschereau family's future took place, mainly establishing their seigneury of Sainte-Marie-de-la-Nouvelle-Beauce.
Shortly after he died, but by this point, Taschereau's seigneury was nonetheless well established.
One of Gabriel-Elzéar's sisters, Marie-Anne-Louise Taschereau, joined the Ursuline order in Quebec and became superior of the convent.