Margalida Castro Rueda (19 November 1943 – 19 December 2024) was a Colombian theatre and television actress.

Born in San Gil, Santander, Castro grew up in Bogotá and studied music as a child.

She entered Universidad Nacional de Colombia to study architecture; she also studied flute and was part of the university's orchestra, but she dropped her studies after meeting playwright Carlos Perozzo, with whom she would be married for six years.

Her debut on Colombian television would be on the 1967 series La tercera palabra, directed by Bernardo Romero Lozano.

Ever since she would appear in dozens of theatre plays and Colombian telenovelas and television series.