Carles ("Carlos") Costa Masferrer (born 22 April 1968) is a former professional tennis player from Spain.

Additionally, Costa won the Barcelona Open, a tournament hosted by the tennis club where he grew up.

In April 2006 he played in the 2006 Seniors Torneo Godó event in Barcelona where he lost to Sergi Bruguera in the final.

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.