The Hatch Act of 1939, officially An Act to Prevent Pernicious Political Activities, is a United States federal law whose main provision prohibits employees in the executive branch of the federal government, except the president, vice-president, and certain designated high-level officials of that branch,[1] from engaging in some forms of political activity. The law was named for Senator Carl Hatch of New Mexico. It was most recently amended in 2012.

President Barack Obama signed the Hatch Act Modernization Act of 2012 on December 28, 2012. It modified penalties under the Hatch Act to allow for disciplinary actions in addition to removal for federal employees; clarified the applicability to the District of Columbia of provisions that cover state and local governments; limited the prohibition on state and local employees running for elective office to employees whose salary is paid completely by federal loans or grants.