Sérgio Miguel Moreira Paulinho, ComIH (born 26 March 1980) is a Portuguese road bicycle racer for Portuguese professional cycling team Efapel. He was a domestique in the 2007, 2009 and 2010 Tour de France and won the silver medal for Portugal in the 2004 Athens Olympic Games.

Paulinho was born in Oeiras. After winning a bronze medal in the 2002 UCI Road World Championships, in under-23, in 2003, he became a professional cyclist and started gaining reference in one of the most important Portuguese teams: LA Pecol. In 2004, he was 6th in the Tour of Portugal (Volta), winning two stages, including the final Individual time trial. In the 2004 Athens Olympic Games, he was silver medalist (Italy's Paolo Bettini got gold and Axel Merckx bronze) in the cycling road race.

Following his Olympic performance, he was signed by the Liberty Seguros-Würth team. He was implicated in the Operación Puerto doping case but was later cleared by Spanish officials of any links to the Operación Puerto doping case. He took his first Grand Tour stage win in Vuelta a Espana 2006, on stage 10. He joined the Discovery Channel team at the end of the season.