MSW may stand for:

Businesses and organisations

* Manatawny Still Works, a craft distillery in Pottstown, Pennsylvania, United States * Massawa International Airport, Eritrea (by IATA code) * Ministry of Interior (Poland) ( pl, Ministerstwo Spraw Wewnętrznych, links=no)

Science and technology

* Metres sea water, a unit of pressure * Mikheyev–Smirnov–Wolfenstein effect, in particle physics * MSWLogo, an interpreted computer programming language * Machine Status Word, a data segment in the Intel 286 LOADALL instruction set

* Mao Shan Wang, a popular cultivar of durian * Master of Social Work, a postgraduate qualification and academic title * Municipal solid waste {{disambiguation