S74 may refer to: S74 (Long Island bus) S74 (New York City bus) serving Staten Island Birrana S74, an Australian speedcar Expressway S74 (Poland) Fiat S74, a racing car , a submarine of the Canadian Forces Savoia-Marchetti S.74, an Italian airliner Sikorsky S-74, an American helicopter design
S74, a postcode district for Barnsley, England