This chapter provides an overview of the jurisprudence on true threat. It discusses the origin of true threat as an unprotected speech category in Watts v. United States (1969). This chapter also provides the United States Supreme Court’s definition of true threat which was first outlined in 2003, almost four decades after the true-threat doctrine was first introduced. Since only a few courts have applied the true-threat doctrine in the school context, the chapter per the authors discusses some non-school cases that illuminate the application of the doctrine to speech. The chapter then considers examples of school cases that further shed light on the operation of the doctrine. The objective is to facilitate an understanding of the true-threat doctrine. If school officials have an understanding of the true-threat doctrine, they will be less likely to censor protected off-campus student speech.