Carles ("Carlos") Costa Masferrer (born 22 April 1968) is a former professional tennis player from Spain. Costa turned professional in 1988. He was among the game's leading clay court players in the early 1990s.
In this Spanish name, the first or paternal surname is Costa and the second or maternal family name is Masferrer.
Costa was runner-up at the 1992 Italian Open, and reached the fourth round at that year's French Open and US Open. Additionally, Costa won the Barcelona Open, a tournament hosted by the tennis club where he grew up. In May 1992, he reached his career-high singles ranking of World No. 10. Costa retired in 1999.
Costa worked for IMG as an agent of most male Spanish tennis players (including Rafael Nadal). A few years later, Costa left IMG and created his own sports agency company with Rafael Nadal.