Mercedes Castellanos Soánez[a] (born 21 July 1988), known as Merche Castellanos, is a Spanish female handball player for CBF Málaga Costa del Sol and the Spanish national team.

[1][2][3] Merche Castellanos is a renowned Spanish handball goalkeeper currently playing for Costa del Sol Málaga in the Liga Guerreras Iberdrola.

She has been a key player for various teams, including Alcobendas, Mar Alicante, Le Havre (France), Balonmano Zuazo, and Bera Bera,[4] where she won multiple titles including two Spanish Leagues, two Queen's Cups, and one Spanish Supercup.

Merche Castellanos has been a significant player for the Spanish national team, contributing to their gold medal victory at the 2018 Mediterranean Games in Tarragona.

Alongside Silvia Navarro, Merche Castellanos represented Spain as a goalkeeper in the 2020 Tokyo Olympics.