Louis Pierre Vieillot

Louis Pierre Vieillot (; 10 May 1748 – 24 August 1830) was a French ornithologist.

Vieillot is the author of the first scientific descriptions and Linnaean names of a number of birds, including species he collected himself in the West Indies, as well as North American and South American species discovered but not formally named by Félix de Azara and his translator Sonnini de Manoncourt. In 1820, Vieillot undertook the continuation of the , commenced by Pierre Joseph Bonnaterre in 1790. He also published an (1823–1830).

Toward the end of his life, Vieillot became blind. He was granted a government pension in his final year, but died in relative poverty.

Some believe that Leach's storm petrel should be named "Vieillot's storm petrel" since he was the first to obtain a specimen of the species and to describe it. He did this in the New Dictionary of Natural History, published in 1817. He described the type location as the shores of Picardy, "se tient sur l"Ocean."