Sebastiao Mazarelo was an Indian politician and medical practitioner.

He was also one of the notable individuals that played a pivotal role in the Goa Opinion Poll.

[3][4][5] Sebastiao Mazarelo was born at Goreamorod, Velim in Portuguese Goa.

[6] He had a son, Wilson Benigno Duarte Mazarello, a former footballer and medical practitioner, who played for Associacao Academica de Goa.

On 31 December 2020, ailing to his health, he died in London, aged 79.