Sebastien Pillay (born 26 January 1978) is a Seychelles politician.

After receiving promotions within the Department of Education, he then became a Lecturer at the University of Seychelles.

[1] Pillay was first elected to the National Assembly in 2011 on the United Seychelles (then called "People's Party") list.

[1] He was sworn in as the Leader of the Opposition for the Assembly term beginning 28 October 2020.

[2] Pillay was a member of the Electoral Assessment Mission for the 2015 United Kingdom general election.