OUT.FEST – Barreiro International Exploratory Music Festival (“Festival Internacional de Música Exploratória do Barreiro” in Portuguese, generally referred to simply as OUT.FEST) is an annual music festival held in the city of Barreiro, Portugal since 2004.

Many of the sites chosen are often not regularly used for musical events of any sort - for example, the 2017 edition’s first and second days were held in a local church (Igreja de Santa Maria) and an industrial Museum (Museu Industrial da Baía do Tejo) respectively.

This itinerancy and use of lesser-known local landmarks and buildings as concert spaces has been one of the hallmarks of the festival, and serves as a way to help both visitors and locals explore the city of Barreiro.

OUT.FEST is also a regular feature in many Portuguese and international publications, being covered by The Wire Magazine,[3] The Quietus,[4] El País,[5] RTP,[6] VICE[7] and Jornal Público,[8] among others.

Among the notable artists who have been a part of the festival over the years are The Fall, Panda Bear, William Basinski, Oneohtrix Point Never, Rafael Toral, Evan Parker, James Ferraro, Sei Miguel, Faust and Matana Roberts.