Antonio Bonilla Sanmartín (6 December 1882 – 9 November 1937) was a Spanish sport shooter who competed in the 1920 Summer Olympics.^[1] He was killed in action during the Spanish Civil War.^[2]

In the 1920 Summer Olympics he participated in the following events:^[3]

• 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