William Henry Harrison Miller (September 6, 1840 – May 25, 1917) was an American lawyer and Attorney General of the United States.

[2] After the war, Miller moved to Toledo, Ohio, read law in the office of Morrison Waite, later Chief Justice of the United States, and was admitted to the bar at Peru, Indiana in 1865.

[2] Miller also served as President of the Indianapolis Bar Association from 1884 to 1885,[3] and was "for many years... a trusted advisor" to leaders of the Republican Party in Indiana.

[2] On March 5, 1889, President Harrison appointed Miller United States Attorney General, sending the appointment to the United States Senate along with most of his other cabinet nominations, with the entire cabinet being "confirmed in a ten minute executive session of the senate".

[4] At the time of his appointment, it was reported that Miller was "considered a wealthy man, having grown rich in the practice of his profession".