| Luis Proto Barbosa | |
| Birth Date: | 1927 1, df=yes |
| Birth Place: | Goa, Portuguese India |
| Death Place: | Margao, Goa, India |
| Office: | 3rd Chief Minister of Goa |
| Term: | 14 April 1990 – 14 December 1990 |
| Predecessor: | Churchill Alemao |
| Successor: | President's rule |
| Office5: | Speaker of the Goa Legislative Assembly |
| Termstart5: | January 1990 |
| Termend5: | April 1990 |
| Predecessor5: | Dayanand Narvekar |
| Successor5: | Surendra Sirsat |
| Office2: | Member of the Goa Legislative Assembly |
| Term Start2: | 1989 |
| Term End2: | 199? |
| Predecessor2: | constituency established |
| Successor2: | Radharao Gracias |
| Constituency2: | Loutolim |
| Termstart3: | 1984 |
| Term End3: | 1989 |
| Predecessor3: | Froilano Machado |
| Successor3: | Mauvin Godinho |
| Constituency3: | Cortalim |
| Termstart4: | 1963 |
| Term End4: | 1977 |
| Predecessor4: | constituency established |
| Successor4: | Froilano Machado |
| Constituency4: | Cortalim |
Luis Proto Barbosa (11 January 1927 – 6 October 2011) was an Indian politician who 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.[1] Barbosa headed a coalition government of 6 Congress defectors by joining in a coalition with the much larger 18 member Maharshtrawadi Gomantak Party.[2] [3] [4] He was affectionately known as Poto Barboz.