As a documentary filmmaker León de Aranoa directed the Mexican film Walkers (2001), which won festival awards in Havana, Los Angeles, New York City and Alcalá de Henares. In 2007 he took part in the documentary Invisibles directing the chapter entitled "Buenas Noches, Ouma". This documentary also featured the participation of the Directors Mariano Barroso, Isabel Coixet, Wim Wenders and Javier Corcuera and was given the Goya Award for Best Documentary. In addition, in 1994 he collaborated in the direction of Izbieglize, and in 2000 he wrote the script for the documentary The Back of the World.