text: Simplicio de Castro
  
  Simplicio de Castro (January 13, 1914 – 1940s) was a Filipino boxer who competed in the 1936 Summer Olympics. In 1936 he was eliminated in the quarterfinals of the welterweight class after losing his fight to Roger Tritz.
  
  He was killed during World War II.
  
  References
  
  External links
  Simplicio de Castro's profile at Sports Reference.com
  Mention of Simplicio de Castro's death
  
  Category:1914 births
  Category:1940s deaths
  Category:Welterweight boxers
  Category:Olympic boxers of the Philippines
  Category:Boxers at the 1936 Summer Olympics
  Category:Filipino male boxers