The 19th 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, 1825, to March 4, 1827, during the first two years of John Quincy Adams's presidency. The apportionment of seats in the House of Representatives was based on the 1820 United States census. The Senate had a majority of Jackson Men, while the House had an Anti-Jackson (pro-Adams) majority.

The presidency of John Quincy Adams, began on March 4, 1825, when John Quincy Adams was inaugurated as President of the United States, and ended on March 4, 1829. Adams, the sixth United States president, took office following the 1824 presidential election, in which he and three other Democratic-Republicans—Henry Clay, William H. Crawford, and Andrew Jackson—sought the presidency. Adams was not a strong president, and he was under continuous attack from Jackson who easily defeated him in the 1828 presidential election.