Diego Castillo

Diego Castillo may refer to:
 * Diego Castillo (swimmer) (born 1991), Panamanian swimmer
 * Diego Castillo (pitcher) (born 1994), Dominican baseball pitcher
 * Diego Castillo (infielder) (born 1997), Venezuelan baseball infielder
 * Diego Castillo (badminton) (born 2001), Chilean badminton player