The United States Civil Service Commission was a government agency of the federal government of the United States and was created to select employees of federal government on merit rather than relationships. In 1979, it was dissolved as part of the Civil Service Reform Act of 1978; the Office of Personnel Management and the Merit Systems Protection Board are the successor agencies.

The Pendleton Civil Service Reform Act is a United States federal law passed by the 47th United States Congress and signed into law by President Chester A. Arthur on January 16, 1883. The act mandates that most positions within the federal government should be awarded on the basis of merit instead of political patronage.

By the late 1820s, American politics operated on the spoils system, a political patronage practice in which officeholders awarded their allies with government jobs in return for financial and political support. Proponents of the spoils system were successful at blocking meaningful civil service reform until the assassination of President James A. Garfield in 1881. The 47th Congress passed the Pendleton Civil Service Reform Act during its lame duck session and President Chester A. Arthur, himself a former spoilsman, signed the bill into law.

The Pendleton Civil Service Act provided for the selection of some government employees by competitive exams, rather than ties to politicians or political affiliation. It also made it illegal to fire or demote these government officials for political reasons and created the United States Civil Service Commission to enforce the merit system. The act initially only applied to about ten percent of federal employees, but it now covers most federal employees. As a result of the court case Luévano v. Campbell, most federal government employees are no longer hired by means of competitive examinations.

The namesake of the Pendleton Act is George H. Pendleton, an Ohio Democratic U.S. senator who defended slavery in the 1850s and led the anti-war "Copperheads" in the American Civil War opposing President Abraham Lincoln. The passage of the Pendleton Civil Service Reform Act with the aid of "Half-Breed" Republicans furthered the aims of white supremacist Democrats to curtail patronage, which had been used by "Stalwart" Republicans to socially and economically benefit blacks.