Carlos Alberto de Oliveira Secretário (born 12 May 1970) is a Portuguese retired footballer who played mainly as a right back, and is the manager of French club US Créteil-Lusitanos.
During his 17-year career, in which he appeared in 341 Primeira Liga games and scored 12 goals, he played for six clubs in his country including Porto, with which he won 15 major titles.
He also briefly represented Real Madrid.
Secretário played more than 30 times with the Portugal national team, representing the country in two European Championships.