Johnson's is a restaurant in Grand Theft Auto IV.
It is located on Crockett Avenue in Firefly Island and has been running since 1970. The business is inaccessible to the player. Johnson's is open all year round, unlike many of the other businesses in Firefly Island which are seasonal and closed over winter.
They sell hot dogs and other sausages as well as seafood and Freedom Fries. Johnson being a slang term for a penis means much of the advertising uses Rockstar's typical innuendo. Also selling seafood including clams and crab allows further innuendo around getting crabs (aka pubic lice). They do not appear to be licensed for alcohol and advertise Sprunk.
The company parodies Nathan's Famous.