Terry Sloane is a fictional superhero appearing in DC Comics, and the first character named Mister Terrific.

Having accomplished all of his goals by the time he was in his early 20s, Terry felt there were no challenges left for him to pursue, leading him towards suicidal tendencies.

[4] According to Jess Nevins' Encyclopedia of Golden Age Superheroes, "his Rogues Gallery includes Black Barax, the Tyrant from the Year 7532; Dr. Laff, who uses practical jokes like itching powder and venomous snakes to commit crimes; the Five Geniuses, five talented men who commit crimes to entertain themselves; and Terry Savatte, a tap dancing savate master".

He was seen being looked after by Phantom Lady during a gathering of heroes on Blackhawk Island, after the final defeat of the alien Apellaxian army.

Terrific is one of seven JSA-related heroes whose earliest solo appearances are collected in an anthology entry in the DC Archive Editions series: