Marie Joseph Saint-Gal (1841-1932) was a French botanist.

Born on February 11, 1841, in Redon, France, Joseph Saint-Gal's father was a driver of the Ponts et Chaussées.

After graduating from the Imperial School of Agriculture of Grand-Jouan in 1863, Joseph Saint-Gal became a tutor-preparer of rural engineering and botany-forestry in 1864.

[1] Then he worked as a teacher at the imperial agricultural school of Grignon in 1869, where he remained for a year.

Having become professor of the chair of botany and forestry, he returned to the national agricultural school of Grandjouan in 1870, where he was also president of the Friendly Association of Former Students created in 1863.