Cecilia Raquel Costa Melgar[1] (born 26 December 1992) is a Chilean former tennis player.

Costa Melgar won four singles and seven doubles titles on the ITF Women's Circuit.

On 20 May 2013, she reached her best singles ranking of world No.

Since her debut for Chile in 2010, Costa Melgar has realized a 15–6 record for her country in Fed Cup competition.

This biographical article relating to Chilean tennis is a stub.