The Era of Good Feelings marked a period in the political history of the United States that reflected a sense of national purpose and a desire for unity among Americans in the aftermath of the War of 1812. The era saw the collapse of the Federalist Party and an end to the bitter partisan disputes between it and the dominant Democratic-Republican Party during the First Party System. President James Monroe strove to downplay partisan affiliation in making his nominations, with the ultimate goal of national unity and eliminating political parties altogether from national politics. The period is so closely associated with Monroe's presidency (1817–1825) and his administrative goals that his name and the era are virtually synonymous.

During and after the 1824 presidential election, the Democratic-Republican Party split between supporters and opponents of Jacksonian Democracy, leading to the Second Party System.

The designation of the period by historians as one of good feelings is often conveyed with irony or skepticism, as the history of the era was one in which the political atmosphere was strained and divisive, especially among factions within the Monroe administration and the Democratic-Republican Party.

The phrase Era of Good Feelings was coined by Benjamin Russell in the Boston Federalist newspaper Columbian Centinel on July 12, 1817, following Monroe's visit to Boston, Massachusetts, as part of his good-will tour of the United States.