Jeffersonian democracy, named after its advocate Thomas Jefferson, was one of two dominant political outlooks and movements in the United States from the 1790s to the 1820s. The Jeffersonians were deeply committed to American republicanism, which meant opposition to what they considered to be artificial aristocracy, opposition to corruption, and insistence on virtue, with a priority for the "yeoman farmer", "planters", and the "plain folk". They were antagonistic to the aristocratic elitism of merchants, bankers, and manufacturers, distrusted factory workers, and strongly opposed and were on the watch for supporters of the Westminster system.

The tertium quids were various factions of the Jeffersonian Republican Party in the United States from 1804 to 1812.