Baggett v. Bullitt, 377 U.S. 360 (1964), was a United States Supreme Court case in which the Court held that a state cannot require an employee to take an unduly vague oath containing a promise of future conduct at the risk of prosecution for perjury or loss of employment, particularly where the exercise of First Amendment freedoms may thereby be deterred.

Washington state passed two laws which required teachers and employees to swear oaths as a condition of employment.

A 1955 law, passed in the McCarthyism era, required the employee to swear he is not a subversive person: that he does not commit, or advise, teach, abet or advocate another to commit or aid in the commission of any act intended to overthrow or alter, or assist in the overthrow or alteration, of the constitutional form of government by revolution, force or violence.

Faculty and staff of the University of Washington sued to overturn the laws.

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