Francisco Mancebo Pérez (born 9 March 1976) is a Spanish professional cyclist, who currently rides for UCI Continental team Matrix Powertag. He initially rode for team Illes Balears–Banesto, but moved to AG2R Prévoyance in 2006.

Mancebo is a stage race specialist, with good climbing and individual time trial performances. He was the winner of the Spanish National Road Race Championships in 2004, and finished third in the Vuelta a España. He finished sixth in the 2004 Tour de France and fourth in the 2005 Tour de France. He also won a stage of the 2005 Vuelta a España and finished fourth in the general classification.