Ana María Loreto Martínez was a Cuban guitarist and singer who was active in Spain, France, and the United Kingdom in the mid 19th-century.

Her musical abilities were recognised at a young age and she became part of the family of the Intendente of Havana, Don Francisco Aguilar, and was educated with his daughters.

[4] In July 1850 Martínez appeared in a divertissement at Her Majesty's Theatre in London called Les Delices du Serail, set in a seraglio.

In a chapter entitled "The Desecration of the Stage" in the periodical Time, an anonymous writer wrote that "the idea of nigger minstrelsy had not yet suggested itself" before Martinez was introduced to the "English opera goer" after a "great flourish of trumpets" and lamented the contemporaneous appearance of the Mastodon Minstrels.

The French writer Théophile Gautier corresponded with Martínez while she was in Paris earlier in 1850, marveling at "La Malibran" and recommending her to various theaters and operas.

Charles Baudelaire wrote of her in a letter to Apollonie Sabatier, "Did you know that the unfortunate [l'infortunée] Mrs. Martínez was hanging out in the lyrical cafes and that she was singing a few days ago at the Alcazar?