Supersub may mean:
- supersub, a cricket term for a type of substitute player/player substitution.
- super-submarine sandwich, a larger, longer or more stuffed hero sandwich.
- a super-submarine, a superior underwater vehicle.
- Japanese supersub, the World War II-era I-400 class submarine
- Narco supersub, the true-submarines (as opposed to semi-subs) for narcotics smuggling, see narco submarine
- Supersub, a nickname of David Fairclough (born 1957), English footballer