Sir Denison Samuel King Miller KCMG, (8 March 1860 – 6 June 1923) was the first governor of the Commonwealth Bank of Australia.

His appointment was dated 1 June 1912, and in July the bank's business was started in a small room in Collins Street, Melbourne, the staff consisting of Miller, and a messenger lent by the department of the treasury.

On the opening day over £2,000,000 (equivalent to $274,466,000 in 2022) was received in deposits, the greater part being Commonwealth government accounts.

[citation needed] It was essential that the public should have complete faith in the new venture, and he was careful to avoid competition with the established banks which might be considered unfair.

In the first year progress was comparatively slow though steady, but the bank soon began to expand, and when World War I came in August 1914 it was in a position to do its most important work.

In the transactions which consequently arose Miller's advice and the resources of the bank were always at the service of the various governments, and were sources of great strength to them.

He was interested in various charities, and was a founder and for some time honorary treasurer of the New South Wales Institute of Bankers.