Herbert Brayley Collett CMG, DSO, VD (12 November 1877 – 15 August 1947) was an Australian politician, librarian and soldier.

[1] Collett joined the Metropolitan Rifle Volunteers at the age of 16 and rose to command the 11th Australian Infantry Regiment as a lieutenant colonel in 1908.

With the outbreak of the First World War he commanded the 28th Battalion of the Australian Imperial Force from 23 April 1915 and he served at Gallipoli, in Egypt and Sinai and in France.

[1] Collett was assistant general secretary of Perth's amalgamated library, museum and art gallery from 1915 to 1933 and president of the Western Australia branch of the Returned Sailors and Soldiers' Imperial League from 1925 to 1933.

[1] In April 1933, Collett was appointed to fill a casual vacancy in the Australian Senate, representing the United Australia Party.