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. 367. On 8 September 2014, she peaked at No. 216 in the doubles rankings.

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

After retiring from professional tennis, Costa Melgar became a beach tennis player.^[2]

Result	No.	Date	Tournament	Surface	Opponent	Score
Loss	1.	Aug 2008	ITF Bell Ville, Argentina	Clay	Verónica Spiegel	1–6, 1–6
Loss	2.	Oct 2011	ITF Bogotá, Colombia	Clay	Patricia Kú Flores	7–6(6), 5–7, 3–6
Loss	3.	Jul 2012	ITF La Paz, Bolivia	Clay	Guadalupe Moreno	5–7, 3–6
Loss	4.	Aug 2012	ITF Santa Cruz, Bolivia	Clay	Camila Silva	4–6, 7–6(1), 3–6
Win	1.	Sep 2012	ITF Pereira, Colombia	Clay	Anastasia Kharchenko	6–2, 6–3
Win	2.	Sep 2012	ITF Bogotá, Colombia	Clay	Yuliana Lizarazo	1–6, 6–3, 6–4
Win	3.	Oct 2012	ITF Santiago, Chile	Clay	Daniela Seguel	6–4, 6–2
Loss	5.	Nov 2012	ITF Quillota, Chile	Clay	Camila Silva	5–7, 6–4, 1–6
Win	4.	Aug 2013	ITF La Paz, Bolivia	Clay	Macarena Olivares López	4–6, 6–1, 6–1
Loss	6.	Nov 2013	ITF Santiago, Chile	Clay	Nadia Podoroska	2–6, 7–5, 5–3 ret.

Result	No.	Date	Tournament	Surface	Partner	Opponents	Score
Win	1.	Nov 2009	ITF Lima, Peru	Clay	Andrea Koch Benvenuto	Agustina Eskenazi Paula Ormaechea	6–1, 6–3
Win	2.	May 2011	ITF Itaparica, Brazil	Hard	Flávia Guimarães Bueno	Isabella Robbiani Luciana Sarmenti	6–3, 3–6, [10–8]
Loss	1.	Aug 2011	ITF Versmold, Germany	Clay	Daniela Seguel	Elizaveta Ianchuk Julia Mayr	4–6, 3–6
Loss	2.	Oct 2011	ITF São Paulo, Brazil	Clay	Gabriela Cé	Maria Fernanda Alves Karina Venditti	2–6, 4–6
Loss	3.	Oct 2011	ITF Bogotá, Colombia	Clay	Belén Ludueña	Patricia Kú Flores Katherine Miranda Chang	4–6, 5–7
Loss	4.	Mar 2012	ITF Puebla, Mexico	Hard	Flávia Guimarães Bueno	Ivette López Ana Paula de la Peña	1–6, 6–7(0)
Win	3.	Sep 2012	ITF Pereira, Colombia	Clay	Anastasia Kharchenko	Gabriela Coglitore Patricia Kú Flores	6–1, 6–0
Loss	5.	Oct 2012	ITF Santiago, Chile	Clay	Daniela Seguel	Aranza Salut Carolina Zeballos	6–4, 4–6, [8–10]
Win	4.	Oct 2012	ITF Santiago, Chile	Clay	Daniela Seguel	Ornella Caron Aranza Salut	6–3, 6–4
Win	5.	Nov 2012	ITF Quillota, Chile	Clay	Camila Silva	Sofía Luini Bárbara Montiel	6–1, 6–1
Loss	6.	Aug 2013	ITF Santa Cruz, Bolivia	Clay	Camila Giangreco Campiz	María Fernanda Álvarez Terán Daniela Ruiz	5–7, 3–6
Win	6.	Sep 2013	ITF Mont-de-Marsan, France	Clay	Daniela Seguel	Alizé Lim Laura Thorpe	6–4, 6–2
Loss	7.	Sep 2013	ITF Seville, Spain	Clay	Gaia Sanesi	Paula Cristina Gonçalves Florencia Molinero	3–6, 5–7
Loss	8.	Oct 2013	ITF Casablanca, Morocco	Clay	Anastasia Grymalska	Paula Kania Valeria Solovyeva	6–7(3), 4–6
Loss	9.	Dec 2013	ITF Santiago, Chile	Clay	Daniela Seguel	Verónica Cepede Royg María Irigoyen	6–2, 4–6, [5–10]
Win	7.	Jul 2014	ITF Knokke, Belgium	Clay	Aliona Bolsova	Justine De Sutter Sofie Oyen	4–6, 6–3, [10–4]
Loss	10.	Oct 2014	ITF Lima, Peru	Clay	Nathaly Kurata	Sofía Luini Guadalupe Pérez Rojas	4–6, 3–6

• Cecilia Costa Melgar at the Women's Tennis Association
• Cecilia Costa Melgar at the International Tennis Federation
• Cecilia Costa Melgar at the Billie Jean King Cup (archived)