Captain William Charles Campbell, Distinguished Service Order, Military Cross with Bar (27 April 1889 – 26 February 1958), was a World War I fighter pilot of Scots heritage who was credited with 23 victories. Serving with No. 1 Squadron during 1917, he was a notable balloon buster, being the first British ace to down five enemy observation balloons. He also claimed eleven aircraft destroyed, and seven (including two shared) 'driven down out of control'.