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.

The 47th United States Congress was a meeting of the legislative branch of the United States federal government, consisting of the United States Senate and the United States House of Representatives. It met in Washington, D.C. from March 4, 1881, to March 4, 1883, during the six months of James Garfield's presidency, and the first year and a half of Chester Arthur's presidency. The apportionment of seats in this House of Representatives was based on the 1870 United States census. The House had a Republican majority; the Senate was evenly divided for the first time ever, with no vice president to break ties for most of this term.