Diogo Pereira Mateus (born Lisbon, 7 February 1980) is a Portuguese rugby union player.
He came through the ranks at Belenenses (after a stint at "Clube dos TLP"), he was on the books with Heineken Cup champions Munster in the 2006/07 season.
He was called for the 2007 Rugby World Cup, playing in three games and remaining scoreless.
[1] He was also a notable 7's player, being captain of the Portuguese national Sevens rugby team.
This biographical article relating to Portuguese rugby union is a stub.