César López Giraldo (born 1973) is a classically trained musician, composer, producer guitarist and pianist from Bogota, Colombia.

In 2003, López founded the Battalion of Immediate Artistic Reaction which involves various musicians and activists seeking alternatives to the ever-present violence that has plagued Colombia over many years.

When advised, the group is widely known to immediately convene together to play for the victims directly impacted by the violence within the country.

[1] Cesar Lopez is officially a 'Non Violence Messenger' of the United Nations and an 'Emissary of Consciousness' for Amnesty International.

So far, only a few dozen of these guitars have been produced, but upon completion, López intends to give the guitars to high-profile musicians across the world, such as Juanes, Fito Páez, Bob Geldof and Manu Chao, and to political and religious leaders such as Kofi Annan.