The 25th 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, 1837, to March 4, 1839, during the first two years of Martin Van Buren's presidency.

The presidency of Martin Van Buren began on March 4, 1837, when Martin Van Buren was inaugurated as President of the United States, and ended on March 4, 1841. Van Buren, the incumbent vice president and chosen successor of President Andrew Jackson, took office as the eighth United States president after defeating multiple Whig Party candidates in the 1836 presidential election. A member of the Democratic Party, Van Buren's presidency ended following his defeat by Whig candidate William Henry Harrison in the 1840 presidential election.