Raul Tyson Isac Dias Monteiro or Raul Isac (born 2 February 1988) is a footballer who plays as a defender. Born in Australia, he made six appearances for the Timor-Leste national team.
For four years Isac played for the Victorian 3rd Division State League side North Sunshine Eagles FC. In 2012, he signed with local East Timor side Dili United.
Isac made his senior debut for Timor-Leste on 29 June 2011 in a match against Nepal during the 2014 FIFA World Cup qualifying rounds.
Raul was born in Melbourne, Australia to Timorese parents who immigrated there. He studied at RMIT University of Melbourne.