William Adams Richardson was an American lawyer who served as the 29th United States secretary of the treasury from 1873 to 1874. During his tenure, the Panic of 1873 swept the nation and caused a depression that lasted five years. He controversially responded by issuing $26 million in greenbacks, which averted the crisis, although there was debate as to whether he had the authority to do so. His tenure was marred by the Sanborn incident in 1874, which involved favoritism and profiteering in the collection of unpaid taxes. He was later appointed a judge, and subsequently the chief justice, of the United States Court of Claims.

The United States secretary of the treasury is the head of the United States Department of the Treasury, and is the chief financial officer of the federal government of the United States. The secretary of the treasury serves as the principal advisor to the president of the United States on all matters pertaining to economic and fiscal policy. The secretary is, by custom, a member of the president's cabinet and, by law, a member of the National Security Council.