Omer Letorey (4 May 1873 – 21 March 1938) was a French composer.

Born in Chalon-sur-Saône, from 1887 Letorey attended the music school of Louis Niedermeyer. From 1891 he studied at the Conservatoire de Paris with Émile Pessard; at the same time he became organist at the Ste-Elisabeth church. In 1895 he won the first Premier Grand Prix de Rome with the lyrical scene Clarisse Harlowe.

After his studies Letorey was musical director at the Comédie-Française until 1922. Furthermore, he was from 1900 successor of Edmond Missa, organist at the Église Saint-Thomas-d'Aquin, from 1903 cantor and organist at the St-Pierre-de-Chaillot church and from 1923 to 1925 cantor at the St-Honoré-d'Eylau church.

In addition to church music, Letorey composed several drama music and operas. His incidental music for Macbeth, which was premiered in 1914 at the Comédie Française, and the opera Le Sicilien (after Molière), which was premiered in 1930 at the Opéra-Comique with the mezzo-soprano Germaine Cernay, had great success.

Letorey died in Issy-les-Moulineaux in 1938.