John Edward Walsh Jr. (born December 26, 1945) is an American television personality, criminal investigator, victim rights advocate, as well as the host and creator of the TV show America's Most Wanted.

Walsh is known for his anti-crime activism, becoming involved following the abduction and brutal murder of his son Adam in 1981 (he was their only child at the time). Convicted serial killer Ottis Toole confessed to Adam's murder, but was never convicted of the crime because evidence was reportedly lost and Toole later recanted his confession. In 2008, the late serial killer Ottis Toole was officially named as Adam's killer and the case was considered closed.