Tom Boutillier is a legal counselor and a minor character in the horror novel, It. He is a local Derry District Attorney who is often involved in analyzing and examining murder and homicide related cases. Along with police chief Andrew Rademacher, he interrogated Christopher Unwin, who was believed to be one of the three assailants (the other two being John Garton and Steven Dubay) behind the killing of a homosexual victim named Adrian Mellon. It was Boutillier who had correctly identified Unwin as being the "weak link" of his group.