Mellow Mushroom Pizza Bakers is a pizzeria that was established in Atlanta, Georgia in 1974 and operates as a restaurant franchise with over 150 locations throughout the United States. Its headquarters are in unincorporated Fulton County, Georgia.

Mellow Mushroom specializes in pizza, but also serves calzones, hoagies, salads, and appetizers. Pizza is sold in three sizes, but slices are available during lunch and late night at some locations. Some Mellow Mushrooms deliver; those that do not have a pick-up option. They often feature a large selection of beer, typically 20-40 beers on draft and 50 or more bottles. Each store is decorated differently and sometimes there is a unifying theme to the artwork. Tie-dye and colorful mushrooms are a common theme for locations. Some stores occasionally feature live music, trivia competitions, or bingo. Many of the locations participate in a beer-purchase loyalty program called Beer Club. The franchise aims to give customers a "relaxing yet eclectic dining experience" with "easygoing atmosphere and funky decor" Mellow Mushroom also sells branded merchandise and clothing on their website Mellow Gear and at stores.