Paulo Sergio Carvallo (born 11 July 1976) is a Paraguayan former professional tennis player.

[1] Born in Asunción, Carvallo played in 15 Davis Cup ties for Paraguay, from his debut in 1999.

[2] This was his final Davis Cup appearance until 2010, when he played a one-off tie before retirement.

While competing on the professional tour he reached a career high singles ranking of 354.

Carvallo represented Paraguay at the 2003 Pan American Games in Santo Domingo.