Tomás Onésimo Canavery (1839–1913) was an Argentine Catholic priest and military chaplain, who served under the command of Bartolomé Mitre during the War of the Triple Alliance.
He participated in most of the military actions against the Paraguayan forces, being promoted to lieutenant colonel in the same battlefield by order of General Juan Andrés Gelly y Obes.He had a long career as a parish priest of the Province of Buenos Aires, serving in the curacy of Almirante Brown, Benito Juárez, Moreno, Ramallo and others.