SZD

SZD may refer to:
 * Schizoaffective disorder, a psychiatric diagnosis with symptoms of a mood disorder and schizophrenia
 * Sheffield City Airport (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