Peter St George Bruce Turnbull, DFC (9 February 1917 – 27 August 1942) was an Australian fighter ace of World War II, credited with twelve aerial victories.

Born in Armidale, New South Wales, he was an electrician before he joined the Royal Australian Air Force (RAAF) in January 1939.

[4][5] He was promoted to flying officer on 20 April 1940, and posted to the Middle East with his unit on 15 July, disembarking at Suez, Egypt, the following month.

[1][8] On 3 April, he claimed four Messerschmitt Bf 110 heavy fighters in a single sortie flying a Hurricane he had christened Ortogo; his commanding officer praised him as "quick to the kill".

He shot down two more of the same type over Palmyra less than two weeks later, and followed this up by claiming two Vichy Dewoitine D.520 fighters during escort duty on 10 July.

[4] With his tally of victories in the Middle East standing at nine, Turnbull was awarded the Distinguished Flying Cross for the 116 operational sorties and 200 hours he had flown, numerous enemy aircraft destroyed in the air and on the ground, and "magnificent fighting spirit and great skill".

[20] During the Battle of Milne Bay, Turnbull's unit was engaged in air defence against Japanese raiders and offensive strikes against shipping and other targets in support of Australian ground forces.

[21] On 7 August, inclement weather forced Turnbull and another pilot to crash land on Goodenough Island; they were later picked up by an Allied patrol.

[23] Two days later, Turnbull was patrolling for Japanese tanks with another member of his squadron, Flight Lieutenant Ron Kerville.

[18][24] Initially posted as missing, Turnbull was confirmed dead on 4 September when troops from the 2/12th Battalion found the wreckage of his plane and his body inside.

According to the official history of the Australian Army during World War II, the "soldiers much admired and appreciated the work of the two R.A.A.F.

[24] By 7 September the Japanese had withdrawn their troops from the Milne Bay area; Generals Sydney Rowell and Cyril Clowes both described the efforts of Nos.

[2][30] His name appears on panel 104 of the Commemorative Area at the Australian War Memorial, Canberra,[31] and on the Glen Innes Roll of Honour.

3 Airstrip was renamed Turnbull Field in his honour; it marked the furthest westward advance of the Japanese in the area.