Martin Firrell (born 4 April 1963 in Paris, France) is a British public artist. Firrell uses language to engage directly with the public, provoking dialogue, usually about aspects of marginalisation, equality and equitable social organisation. The artist's reported aim is 'making the world more humane'. He is one of a trio of artists (with Jenny Holzer and Barbara Kruger) known for socially engaged public art practice where text is foundational and central to that practice. His work has been summarised as "art as debate".