Ángel Gregorio Villoldo Arroyo (16 February 1861 – 14 October 1919) was an influential Argentine musician, lyricist, and composer, recognized as a pioneer in the development of tango music. Born in the Barracas neighborhood of Buenos Aires, Villoldo held various jobs, including typographer, tram driver, circus clown, and journalist, before dedicating himself to music. He was largely self-taught in guitar and singing.

Villoldo played a crucial role in transforming Spanish musical forms such as tanguillos, cuplés, and habaneras into distinctly Argentine rhythms, contributing significantly to the tango genre. His most famous compositions, "El Choclo" and "La Morocha," were among the first tangos to gain widespread popularity and international success.

Active in Buenos Aires' entertainment scene around the turn of the 20th century, Villoldo wrote comic songs and cuplés for local theatres, collaborating with notable actors like Pepe and Pablo Podestá. His performances often featured guitar and harmonica accompaniments, and his lyrics were known for their humor and topical references, reflecting his journalistic background.

In 1907, Villoldo traveled to Paris with Alfredo Eusebio Gobbi and Flora Rodríguez to make some of the earliest tango recordings, which helped introduce the genre to European audiences. Despite his significant contributions, by the 1910s, Villoldo's popularity began to wane as new musical trends emerged. He passed away in Buenos Aires in 1919, leaving a lasting legacy as a foundational figure in the history of tango music.