Louis-Marie Baudouin (2 August 1765 - 12 February 1835) was a French Roman Catholic priest who was the founder of the Sons of Mary Immaculate and the Ursulines of Jesus.

He became a hunted and proscribed priest who heard confessions and celebrated Mass in an underground cellar.

He spent most of it in Toledo, where Archbishop Francisco Antonio de Lorenzana sheltered over 400 French priests.

While there, his brother's health failed and Pierre Martin Baudouin died in Toledo at the age of forty-seven.

[1] While in Spain, Louis-Marie became a skilled lace maker, should he need to obtain a workman's passport to return to France.

In August 1797, he and his colleague Father Lebédesque made their way to Bordeaux, where friends brought them to Libourne.

[1] In 1799 Napoleon Bonaparte allowed free exercise of worship following the end of the wars of the Vendée.

Baudouin moved to La Rochelle where he was appointed as the superior of the seminary and as the vicar general of the diocese.