John Linton Treloar, OBE (10 December 1894 – 28 January 1952) was an Australian archivist and the second director of the Australian War Memorial (AWM). During World War I he served in several staff roles and later headed the First Australian Imperial Force's (AIF) record-keeping unit. From 1920 Treloar played an important role in establishing the AWM as its director. He headed an Australian Government department during the first years of World War II, and spent the remainder of the war in charge of the Australian military's history section. Treloar returned to the AWM in 1946, and continued as its director until his death.
Treloar's career was focussed on the Australian military and its history. Prior to World War I he worked as a clerk in the Department of Defence and, after volunteering for the AIF in 1914, formed part of the Australian Army officer Brudenell White's staff for most of the war's first years. He was appointed commander of the Australian War Records Section (AWRS) in 1917. In this position, he improved the AIF's records and collected a large number of artefacts for later display in Australia. Treloar was appointed the director of what eventually became the AWM in 1920, and was a key figure in establishing the Memorial and raising funds for its permanent building in Canberra. He left the AWM at the outbreak of World War II to lead the Australian Government's Department of Information, but was effectively sidelined for much of 1940. In early 1941 he was appointed to command the Australian military's Military History and Information Section with similar responsibilities to those he had held during World War I. He attempted to intervene in the management of the AWM during his absence, however, to the increasing frustration of its acting director. Treloar worked intensely in all his roles and suffered periods of ill-health as a result. Following the war, he returned to the Memorial in 1946 but his performance deteriorated over time, possibly due to exhaustion. He died in January 1952.