The Armourer of Nantes is an opera in three acts, with music by Michael William Balfe and libretto by J. V. Bridgman.

The opera is based on Victor Hugo's 1833 play Marie Tudor and set in Nantes, France, in 1498.

The opera was first produced at Covent Garden, under the management of Louisa Pyne and William Harrison, on 12 February 1863.

Raoul, an armourer from Nantes, has raised an orphan girl, Marie, who was mysteriously entrusted to him as an infant, and he has fallen in love with her.

Fabio learns of this and kills the Jew who has the papers proving Marie's parentage, but not before Raoul finds out the truth.