Impeachment in the United States is an expressed power of the legislature which allows for formal charges to be brought against a civil officer of government for conduct committed in office. The actual trial on those charges, and subsequent removal of an official on conviction on those charges is separate from the act of impeachment itself: impeachment is analogous to indictment in regular court proceedings, trial by the other house is analogous to the trial before judge and jury in regular courts. Typically, the lower house of the legislature will impeach the official and the upper house will conduct the trial.

At the Federal level, the House of Representatives has the sole power of impeaching the President, Vice President and all other civil officers of the United States. Officials can be impeached for: "treason, bribery, or other high crimes and misdemeanors." The United States Senate has the sole power to try all impeachments. The removal of impeached officials is automatic upon conviction in the Senate.

Impeachment can also occur at the state level; state legislatures can impeach state officials, including governors, according to their respective constitutions.