Sir Allen Stanley Brown CBE (3 July 1911 – 2 August 1999) was a senior Australian Public Servant. He was Secretary of the Prime Minister's Department between August 1949 and December 1958.

Allen Brown was born on 3 July 1911. He was educated at Caulfield Grammar School, Wesley College and the University of Melbourne.^[1]

In 1949, Brown served as Secretary of the Department of Post-War Reconstruction.^[2] During his time at the Department, Brown was instrumental in establishing the Snowy Mountains Scheme.^[1]

Brown was Secretary of the Prime Minister's Department between August 1949 and December 1958.^[3] From the Prime Minister's Department, Brown's next appointment was in the diplomatic service, he was Deputy High Commissioner for Australia in the United Kingdom.^[4]

In 1965, Brown was appointed Australian Ambassador to Japan.^[5] While in that role, he led the Australian delegation which observed the 1967 South Vietnamese presidential election. The delegation was invited by the South Vietnamese Government,^[6] and Brown observed polling in Huế.^[7]

Brown retired from the Commonwealth public service in 1971.^[8]

Brown was made a Commander of the Order of the British Empire in January 1953.^[9] He was named a Knight Bachelor in January 1956.^[10]