Firehouse Restaurant Group, Inc., doing business as Firehouse Subs, is a Canadian-owned American fast casual restaurant chain based in Jacksonville, Florida that specializes in submarine sandwiches. It was founded in 1994 by former firefighter brothers Chris and Robin Sorensen.[3][4] Since December 15, 2021, it has been a subsidiary of Restaurant Brands International, which also owns the chains Burger King, Popeyes, and Tim Hortons.

Firehouse Subs has over 1,210 restaurants in 46 states, Puerto Rico, Switzerland, Canada and soon Mexico, United Kingdom and the Middle East by 2024.