Louis-Arsène Lavallée (2 February 1861 at Berthier-en-Haut, Province of Canada – 19 November 1936 at Montreal) was a Mayor of Montreal, Canada. His education was first at the , then at Université Laval's Montreal campus for law studies (which is today the Université de Montréal). He was formally installed as a lawyer in 1884. During his local political career, Lavallée promoted consolidation and amalgamation of municipalities towards a larger Montreal government and saw annexation of municipalities such as Côte-des-Neiges during that time.