St Lazare got its beginning as a Roman Catholic mission in the 1820’s. Founded by Oblate Father Jules DeCorby, who had immigrated from France in 1867. Father DeCorby was at this time attached to the mission at Lebret, Saskatchewan. Father DeCorby named this new mission St Lazare to commemorate the place where departed from France, from which he departed on his journey to Canada.
The Post office opened on September 1, 1895.