Robert Bruce is an 1846 pastiche opera in three acts, with music by Gioachino Rossini and Louis Niedermeyer to a French-language libretto by Alphonse Royer and Gustave Vaëz.

The plot concerns the defeat of the forces of Edward II of England by Robert the Bruce, King of Scots, and is adapted from Walter Scott's History of Scotland.

[1] The music was stitched together by Niedermeyer, with the composer's permission, with pieces from La donna del lago, Zelmira, and other Rossini operas.

[5] The result (which also involved Vaëz's regular collaborator Alphonse Royer as co-librettist) was Robert Bruce, an elaborate pasticcio, based on music not only from La donna del lago and Zelmira, but also from Bianca e Falliero, Torvaldo e Dorliska, Armida, Mosè in Egitto, and Maometto II.

[8] The production included a ballet with the dancers Lucien Petipa, Henri Desplaces, Adèle Dumilâtre, and Maria Jacob, and choreography by Joseph Mazilier.