Australian lyrical poet whose work displays his wartime experiences and sensitivity to nature while conveying a sense of angst and alienation.

Campbell attended Jesus College, Cambridge, to complete a bachelor's degree in 1937, during which time he was influenced by English poetry. After returning to Australia, he joined the Royal Australian Air Force in 1939. In 1941 he was sent to Port Moresby, Papua New Guinea, as a station navigation officer, and in 1942 he was awarded the Distinguished Flying Cross for saving the lives of his crew while piloting a reconnaissance plane over New Britain. His poem Men in Green (1943) recalls his experience as a pilot during World War II. From 1946 to 1968 he worked as a grazier in Australia, raising sheep in Wells Station (1946–60) and Palerang (1960–68). After 1968 he worked full time as a writer.

In 1949 a number of Campbell's early poems were published in Speak with the Sun. With the poem sequence Cocky's Calendar (1961), Campbell began to write in a freer style, and his subjects became increasingly contemporary. From 1964 to 1965 Campbell was poetry editor of The Australian newspaper. He published Selected Poems in 1968 and edited the anthology Modern Australian Poetry (1970). The recipient of several Australian literary awards, he was also a senior fellow (1973–76) of the Literature Board of the Australia Council for the Arts.

Campbell died in 1979, soon after completing his final volume of poetry, The Man in the Honeysuckle, which was published later that year.