Jean Ernest Sébastien Odin (20 January 1889 – 16 October 1975) was a French politician.
He ran unsuccessfully as a Radical in the 1919 and 1924 elections to represent Gironde in the Chamber of Deputies, but succeeded in 1928. In 1932 he was elected to the Senate. He served as a member, and then as secretary, of the Senate committee which dealt with French Navy affairs.
Odin wrote a number of books, Une cause célèbre : le Mystère de l'Ancre Bleue which dealt with the case of Jean-Pierre Vaquier, hanged for the murder of Alfred Jones, with which Odin had been involved in London in 1924. His other successful work was Les Quatre-Vingts on those who had opposed the creation of the Vichy regime.
- Jolly, Jean (1960). "Dictionnaire des Parlementaires français 1889-1940" (in French). Presses Universitaires de France. Retrieved 2007-09-29.