Stephen Dugdale (1640?-1683) was an English informer, and self-proclaimed discoverer of parts of the Popish Plot (which was in reality the fabrication of his fellow informer Titus Oates). He perjured himself on numerous occasions, giving false testimony which led to the conviction and execution of numerous innocent men, notably the Catholic nobleman Lord Stafford, the Jesuit Provincial Thomas Whitbread, and the prominent barrister Richard Langhorne.