William Berkeley Lewis (1784 – November 12, 1866) was an influential friend and advisor to Andrew Jackson. He was born in Loudoun County, Virginia, and later moved near Nashville, Tennessee, in 1809. Major Lewis served as quartermaster under General Jackson. Later, in politics, he was a manager of Jackson and retained considerable influence until Jackson's second term as President of the United States. Jackson appointed Lewis as second auditor of the Treasury, a position he was able to retain until the Polk administration.