Felix Castello (1602–1656) was a Spanish painter of the Baroque period. He was born and died in Madrid. His father, Fabricio Castello, was a painter for King Phillip II of Spain in the Escorial, the palace of Alba de Tormes, and the Palacio Pardo. Felix's grandfather was the painter Juan Bautista (known as the Bergamasco). He later trained with Vicente Carducho and Bartolomé Carducci.
Castello painted for the chapel of Santo Cristo de la Paciencia in the Convent of the Capuchins. he also painted for the cloister of the Convent of Santa Barbara. He is also said to have contributed along with Alonso Cano and others to the portraits of kings for the Royal Palace of Madrid.