Subway is an American multinational fast food restaurant franchise that specializes in submarine sandwiches (subs), wraps, salads and drinks.

Subway was founded by Fred DeLuca and financed by Peter Buck in 1965 as Pete's Super Submarines in Bridgeport, Connecticut. After several name changes in the beginning years, it was finally renamed Subway in 1972, and a franchise operation began in 1974 with a second restaurant in Wallingford, Connecticut. Since then, it has expanded to become a global franchise.

Subway serves an array of topping choices, allowing the customer to choose which toppings are included in their sandwich. The longtime Subway slogan, "Eat Fresh", is intended to indicate the fresh ingredients that are used in their sandwiches.

It was the fastest-growing franchise in the world in 2015 and, as of June 2021, had 37,540 locations in more than 100 countries and territories. More than half its locations (21,796 or 58.1%) are in the United States. It also is the largest single-brand restaurant chain, and the largest restaurant operator in the world. Its international headquarters is in Milford, Connecticut.