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Potbelly Sandwich Works, also known as Potbelly Sandwich Shop, is a fast-casual restaurant chain based in the United States, specializing in submarine sandwiches and milkshakes. Founded in 1977 in Chicago, the company has expanded to 445 locations nationwide. The name "Potbelly" comes from the potbelly stove used by founder Peter Hastings to toast sandwiches in his original antique shop. The menu features a variety of hot and cold sandwiches, customizable salads, milkshakes, soups, and homemade desserts. Potbelly is recognized for its signature toasting technique, which enhances the flavor of its sandwiches. The chain aims to create a community atmosphere, serving lunch and dinner to office workers and students, and often features live music from local musicians. With a mix of company-owned and franchised locations, Potbelly continues to grow both domestically and internationally.