Alexis Lesieur Desaulniers (August 31, 1837 – July 9, 1918) was a Quebec lawyer and political figure.
He studied at the Séminaire de Nicolet, Université Laval in Montreal and McGill University.
He was the father of Arthur Lesieur Desaulniers, who was a Member of the House of Commons from 1917 to 1930 for the district of Champlain.
Desaulniers was elected as a member of the Conservative Party to the Legislative Assembly of Quebec in 1867 for the district of Maskinongé.
He represented the district of Maskinongé from 1884 to 1887 and sat with members of the Conservative Party.