Bipartisanship, sometimes referred to as nonpartisanship, is a political situation, usually in the context of a two-party system (especially those of the United States and some other western countries), in which opposing political parties find common ground through compromise. Partisanship is the antonym, where an individual or political party adhere only to its interests without compromise. 

There have been periods of bipartisanship in American politics, such as when the Republicans supported legislation by Democratic President Lyndon Johnson in the early 1960s, and when Democrats worked with Republican President Ronald Reagan in the 1980s. It is claimed that the non-partisanship in foreign policy was a precursor to the concept of modern bipartisanship in U.S. politics. This was articulated in 1912 by President Taft, who stated that the fundamental foreign policies of the United States should be raised above party differences. In recent years, this was also shown in the case of President H. W. Bush's administration, which began with an atmosphere of bipartisanship on foreign policy in Washington. During this period, the concept of bipartisanship implied a consensus not only between the two parties but also the executive and legislative branches of the government to implement foreign policy. This was seen in the article Bipartisan Objectives for American Foreign Policy, authored by Henry Kissinger, President Nixon's Secretary of State, and Cyrus Vance, who was Secretary during President Carter's administration.

In the United States in 2010, however, there was wide disagreement between the Republicans and Democrats because the minority party has been voting as a bloc against major legislation, according to James Fallows in The Atlantic. In 2010, the minority party has the ability to "discipline its ranks" so that none join the majority, and this situation in the Congress is unprecedented, according to Fallows. He sees this inability to have bipartisanship as evidence of a "structural failure of American government."Adviser to President Obama, Rahm Emanuel, said the period from 2008–2010 was marked by extreme partisanship

There have been efforts to increase bipartisanship by establishing the Problem Solvers Caucus in 2017. This group aims to encourage cooperation between both parties on legislation and consists of approximately 50 members. While this represents a small portion of Congress, party leaders have shown willingness to compromise on important issues, such as the 2018 First Step Act that aimed to reform the criminal justice system. During the initial stages of the COVID-19 crisis, there was a notable bipartisan reaction. In March 2020, senators unanimously voted (96-0) to pass the Coronavirus Aid, Relief, and Economic Security (CARES) Act, the largest economic stimulus package in US history. The House vote was also nearly unanimous. This bipartisan action, occurring shortly after the divisive partisanship surrounding Trump's impeachment, demonstrated that Congress could set aside party differences when deemed necessary. However, partisanship resurfaced later in 2020 when Republicans and Democrats could not reach an agreement on further economic stimulus measures.