| Acronym | Definition |
|---|
| MSW | Master of Social Work |
| MSW | Municipal Solid Waste |
| MSW | Medical Social Worker |
| MSW | Microsoft Word |
| MSW | Mammal Species of the World |
| MSW | Microsoft Windows |
| MSW | Microswitch (electronic switch) |
| MSW | Murder She Wrote (TV show) |
| MSW | Money Smart Week (public awareness; Federal Reserve Bank of Chicago, IL) |
| MSW | Modified Sine Wave (electronic signal shape) |
| MSW | Mary, Seat of Wisdom (Park Ridge, IL) |
| MSW | Machined Side Wall |
| MSW | Machine Status Word |
| MSW | Men Seeking Women |
| MSW | Managing Safe Work (various companies) |
| MSW | Maximum Surface Wind |
| MSW | Management Skills Workshop (various organizations) |
| MSW | Most Significant Word |
| MSW | My Secret World (gaming) |
| MSW | Multiswitch |
| MSW | Mikheyev-Smirnov-Wolfenstein (effect; neutrino oscillation, mass) |
| MSW | Men Who Have Sex with Women (medical/public health) |
| MSW | Michael Skurnik Wines (Syosset, NY) |
| MSW | Mountain Spring Water |
| MSW | Memory Stick Walkman (Sony) |
| MSW | Maiden Special Weights (race for horses that have never won a race) |
| MSW | Master Search Warrant |
| MSW | Meters Sea Water (SCUBA diving) |
| MSW | Main Seawater |
| MSW | Magneto-Static Wave |
| MSW | Mission Science Workshop |
| MSW | Mao Shan Wang (durian) |
| MSW | Maximum Shipping Weight |
| MSW | Minimum Squared Weight |
| MSW | Middleware Sub Working Group |
| MSW | Managed Windows Service |
| MSW | Manual Shift to Working |
| MSW | Multi-Cast with Same Wavelength |
| MSW | Multiple Stop-And-Wait |
| MSW | Multi-Size Sliding Window |