SZ, Sz, sZ, or sz may refer to:

Businesses and organizations Slovenske železnice (SŽ), a Slovenian railway company Green Party (Czech Republic) () Air Southwest (IATA code)

Places Salzgitter (vehicle registration code) Canton of Schwyz Shenzhen, simplify into SZ, a city in Guangdong province, China Eswatini (ISO 3166-1 country code) .sz, the country code top level domain (ccTLD) for Eswatini Switzerland (NATO country code)

Products Alfa Romeo SZ, a car Rolls-Royce SZ and Bentley SZ, a series of different cars produced from 1980 to 2003 by Rolls-Royce Motors and Bentley Motors SZ cycle-car, a Soviet/Russian microcar series including SZA and SZD SZ, a model from Sony's range of VAIO computers Sprite Zero, a diet soft drink

Publications Saarbrücker Zeitung, a German newspaper, based in Saarland Süddeutsche Zeitung, a German newspaper, published in Munich Szőllősy index, catalogue (Sz) of all the compositions of Béla Bartók S/Z, an essay by Roland Barthes, published as a book in 1970

Science and technology Shenzhou (spacecraft), the Chinese space capsule Sunyaev–Zel'dovich effect, in astrophysics Suzuki groups, a family of mathematical groups Suzuki sporadic group, a mathematical group

Other uses Sz (digraph), a digraph used in Hungarian, Polish, Kashubian, German (as ẞ), and Cantonese romanization Sky Zone Sami Zayn, Canadian professional wrestler

See also ß ZS (disambiguation)