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) () Muslim Society of Washington, a religious organization based in the United States
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 Microsoft Windows, an operating system
Other uses Mao Shan Wang, a popular cultivar of durian Master of Social Work, a postgraduate qualification and academic title Municipal solid waste