David S. Castle (13 February 1884 – 28 October 1956) was an architect in Texas.
His firm has been assessed to be Abilene's "most successful architect", and a number of his works are listed on the U.S. National Register of Historic Places.
He was joined in business by his son, architect David S. Castle, Jr. after World War II and until Mr. Castle, Sr.'s death in 1956.
Works include: