Impeachment is the process by which a legislative body or other legally constituted tribunal initiates charges against a public official for misconduct. It may be understood as a unique process involving both political and legal elements.

In Europe and Latin America, impeachment tends to be confined to ministerial officials as the unique nature of their positions may place ministers beyond the reach of the law to prosecute, or their misconduct is not codified into law as an offense except through the unique expectations of their high office. Both "peers and commoners" have been subject to the process, however. From 1990 to 2020, there have been at least 272 impeachment charges against 132 different heads of state in 63 countries. Most democracies (with the notable exception of the United States) involve the courts (often a national constitutional court) in some way.

In Latin America, which includes almost 40% of the world's presidential systems, ten presidents from six countries were removed from office by their national legislatures via impeachments or declarations of incapacity between 1978 and 2019.

National legislations differ regarding both the consequences and definition of impeachment, but the intent is nearly always to expeditiously vacate the office. In most nations the process begins in the lower house of a bicameral assembly who bring charges of misconduct, then the upper house administers an impeachment trial and sentencing. Most commonly, an official is considered impeached after the house votes to accept the charges, and impeachment itself does not remove the official from office.

Because impeachment involves a departure from the normal constitutional procedures by which individuals achieve high office (election, ratification, or appointment) and because it generally requires a supermajority, they are usually reserved for those deemed to have committed serious abuses of their office. In the United States, for example, impeachment at the federal level is limited to those who may have committed "Treason, Bribery, or other high crimes and misdemeanors"—the latter phrase referring to offenses against the government or the constitution, grave abuses of power, violations of the public trust, or other political crimes, even if not indictable criminal offenses. Under the United States Constitution, the House of Representatives has the sole power of impeachments while the Senate has the sole power to try impeachments (i.e., to acquit or convict); the validity of an impeachment trial is a political question that is nonjusticiable (i.e.., is not reviewable by the courts). In the United States, impeachment is a remedial rather than penal process,^: 8 intended to "effectively 'maintain constitutional government' by removing individuals unfit for office";^: 8 persons subject to impeachment and removal remain "liable and subject to Indictment, Trial, Judgment and Punishment, according to Law."

Impeachment is provided for in the constitutional laws of many countries including Brazil, France, India, Ireland, the Philippines, Russia, South Korea, and the United States. It is distinct from the motion of no confidence procedure available in some countries whereby a motion of censure can be used to remove a government and its ministers from office. Such a procedure is not applicable in countries with presidential forms of government like the United States.