Carlos Alberto Correia Fortes (born 20 October 1968), commonly known as Cao, is a Portuguese retired footballer who played as a defensive midfielder.

After unsuccessfully emerging through FC Porto's youth academy he went on to play 12 seasons in the two major levels of Portuguese football, representing Rio Ave FC (second division), F.C.

Tirsense (Primeira Liga), Leça FC (first and second tiers), S.C. Salgueiros (both), S.C. Campomaiorense (both) and F.C.

[1] Cao was part of the Portuguese under-20 team that won the 1991 FIFA World Youth Championship, with the competition being held on home soil.

[2] In 2002 it was revealed that he had in fact been born in 1968, meaning he was crowned Youth World Champion at the age of 22.