Gonzalo de Castro (born 2 February 1963, in Madrid) is a Spanish actor.

He studied law and graduated at age 23, but soon he decided to pursue acting. He debuted in the theatre play Por los pelos (1992). He had small roles in films and theater. In 1999 he started working on the series Siete Vidas as a helper and assistant director. The producer chose him for episodic character (Gonzalo, the owner of the bar) and that character became one of the main ones for seven years.^[1]
Finished Siete Vidas, De Castro starred Doctor Mateo (2009–2011), the Spanish remake of Doc Martin, for which he received several awards for best television actor in 2009 and 2010.^[2]
He has been boyfriend of the actresses Nathalie Poza (until 2008) and Natalia Verbeke (2010–2013).