Gregório Byington Duvivier (born April 11, 1986) is a Brazilian actor, comedian and poet. He is known by his works in film and theater, being one of the members of the comedian troupe Porta dos Fundos.
Duvivier was born in Rio de Janeiro, son of the singer Olivia Byington and musician Edgar Duvivier. At age 9, he studied acting at Tablado school. One year before entering college, Duvivier joined Marcelo Adnet, Fernando Caruso and Marcelo Queiroga in the comedy show Z.É.- Zenas Emprovisadas. He graduated in Literature at Pontifícia Universidade Católica do Rio de Janeiro.