SZD may refer to: Schizoaffective disorder, a psychiatric diagnosis with symptoms of a mood disorder and schizophrenia Sheffield City Airport (former IATA code) Suzhou Railway Station North Square Bus Station (IATA code) The Soviet Railways (Sovetskie Zheleznye Dorogi) A microcar made by SeAZ, SZ cycle-car series Szybowcowy Zakład Doświadczalny, a glider manufacturer in Poland Suzhou East railway station, China Railway pinyin code SZD