Christian Sáinz Valdés Castro (born in Mexico City 8 December 1974), known professionally as Cristian Castro or Cristian, is a Mexican pop singer. He is the son of actors Veronica Castro and Manuel "El Loco" Valdés, and nephew of actors Ramón Valdés (known for playing Don Ramón in El Chavo del 8 ) and Germán "Tin-Tan" Valdés. Of artistic family heritage, he is also a nephew on his mother's side of José Alberto "El Güero" Castro, well-known producer of soap operas on Televisa.
Known for his light tenor vocal range, Castro is regarded as one of the most skilled Hispanic pop singers of the last three decades. Juan Gabriel described Castro as "the man with the most faculties to sing in Mexico".