Luis Proto Barbosa was an Indian politician from the state of Goa. He served as the Chief Minister of Goa for eight months in 1990.
Barbosa was a member of the Indian National Congress. He played a significant role in the historic Opinion Poll of 1967. He was one of the members elected to the first legislative assembly constituted after Goa's Liberation from Portuguese rule. He was also a doctor. Barbosa headed a coalition government of 6 Congress defectors by joining in a coalition with the much larger 18 member Maharshtrawadi Gomantak Party. He was affectionately known as Poto Barboz.