Mesmin (Maximin, Maximinus) (died c. 520 AD) is a French saint associated with the Bishopric of Orléans.

In 508, Euspicius was looking for a place of retreat and found an unoccupied royal villa called Micy near Orléans, at the confluence of the Loire and Loiret rivers.

The monks of Micy contributed much to the civilization of the Orléans region; they cleared and drained the lands and taught the semi-barbarous inhabitants the worth and dignity of agricultural work.

Saint Lié, who later became a hermit in the forest of Orléans, was a monk under Mesmin; as was Leonard of Noblac.

Part of the relics of Saint Mesmin were destroyed by Huguenots in 1562; the rest are kept in the church of Saint-Mesmin in La Chapelle-Saint-Mesmin.

According to her legend, Mesme was the daughter of the Frankish king Dordanus, and the sister of Saint Mesmin.

Furious to learn that his daughter was denying the pagan gods, he asked his son Mesmin to cut off his sister's head to save the honor of the family.

Saint Mesmin buried the head of his sister and a miraculous spring gushed forth, which cured fevers.