(English: John Mary; February 25, 1800 – May 25, 1870) was a French-born prelate of the Catholic Church and a member of the Congregation of the Mission.

[1] After showing interest in Catholicism at age nine, Odin's parents sent him to study Latin under his uncle, the pastor of Noailly.

In 1822, while still in seminary, Odin was recruited by a representative of Bishop Louis Dubourg to do mission work for the Archdiocese of New Orleans.

[4] After his ordination, Dubourg performed missionary work in New Madrid, Missiouri, and with Native American tribes along the Arkansas River.

He briefly served as pastor of St. Vincent de Paul Parish in Cape Girardeau, Missouri, opening a Catholic school there in 1838.

[1] On July 16, 1841, Gregory XVI appointed Odin as the first vicar apostolic of Texas and titular bishop of Claudiopolis in Isauria .

[4] With the assistance of the French chargé d'affaires, Alphonse Dubois de Saligny, Odin successfully negotiated the Texas government's confirmation of the church's title to fifteen acres in San Antonio.

[4] When Odin arrived in New Orleans, Louisiana had seceded from the United States and the American Civil War had started.

With the finances of the archdiocese impacted by the war, Odin issued austerity measures in January 1863 that met with significant opposition.

[9] Odin soon ran into conflict with Father Claude Paschal Maistre, a French priest who was a strong advocate of the abolition of slavery.

[10] When Maistre officiated the funeral of André Cailloux, a mixed-race soldier in the Union Army who died heroically, Odin expressed his condemnation.