Gemma di Vergy is an 1834 tragedia lirica in two acts by Gaetano Donizetti from a libretto by Giovanni Emanuele Bidera. It is based on the tragedy Charles VII chez ses grands vassaux (Charles VII and His Chief Vassals) (1831) by Alexandre Dumas père, which was later to become the subject of the opera The Saracen by the Russian composer César Cui.

Domenico Gaetano Maria Donizetti was an Italian composer, best known for his almost 70 operas. Along with Gioachino Rossini and Vincenzo Bellini, he was a leading composer of the bel canto opera style during the first half of the nineteenth century and a probable influence on other composers such as Giuseppe Verdi. Donizetti was born in Bergamo in Lombardy. At an early age he was taken up by Simon Mayr who enrolled him with a full scholarship in a school which he had set up. There he received detailed musical training. Mayr was instrumental in obtaining a place for Donizetti at the Bologna Academy, where, at the age of 19, he wrote his first one-act opera, the comedy Il Pigmalione, which may never have been performed during his lifetime.