Antonio Bonilla SanmartÃn (6 December 1882 – 9 November 1937) was a Spanish sport shooter who competed in the 1920 Summer Olympics.
He was killed in action during the Spanish Civil War.In the 1920 Summer Olympics he participated in the following events:
Team 30 metre military pistol - sixth place
Team 300 metre military rifle, prone - seventh place
Team 50 metre small-bore rifle - ninth place
Team free rifle - eleventh place
Team 50 metre free pistol - twelfth place
Team 300 and 600 metre military rifle, prone - twelfth place
Team 600 metre military rifle, prone - 13th place
Team 300 metre military rifle, standing - 14th place
300 metre free rifle, three positions - result unknown
50 metre small-bore rifle - result unknown