Jandyr Santos Jr is a Brazilian diplomat. He joined the Ministry of External Relations of Brazil in 2000. Since then he alternated between overseas postings and positions in Brasilia. He served at the Brazilian Mission to the United Nations in New York, the Embassy of Brazil in New Delhi and the Embassy of Brazil in Maputo. He currently heads the unit of the Ministry of External Relations of Brazil responsible for Internet Governance negotiations.

He lives in Brasilia.