Casto Espinosa Barriga is a Spanish footballer who currently features for the Spanish club Real Betis. He plays as a goalkeeper and is the second choice custodian for Betis.
Casto made his professional debut for Mérida UD but could only play 3 matches for the senior side. He was signed by CD Logroñés in 2002 and in 2004 was signed by Albacete.
Real Betis signed Casto in the summer of 2006 and played for Real Betis B for the 2006-2007 season. He made his debut for the senior side in La Liga in December 2007 against Almeria.