Subway is an American restaurant franchise that primarily sells submarine sandwiches (subs) and salads. It is owned and operated by Doctor's Associates, Inc. (DAI). Subway is one of the fastest growing franchises in the world with 37,881 restaurants in 98 countries and territories as of November 7, 2012. It is the largest single-brand restaurant chain globally and is the second largest restaurant operator globally after Yum! Brands (over 37,000 locations).

Subway's main operations office is in Milford, Connecticut; five regional centers support Subway's growing international operations. The regional offices for European franchises are located in Amsterdam, Netherlands; the Australia and New Zealand locations are supported from Brisbane, Australia; the Asian locations are supported from offices located in Beirut, Lebanon, Malaysia, Singapore and India and the Latin America support center is in Miami, Florida.