MW could refer to (in alphabetical order):

• Lintilla - the original multiple worlds talker
• Maintenance of way
• Malawi (ISO 3166-1 country code)
• Master of Wine
• Maya Island Air IATA airline designator
• MediaWiki
• Mediumwave
• Megawatt
• Men's Wearhouse
• Merriam-Webster
• Microwave
• Morrowind
• Multiple Worlds - a type of talker
• Museums and the Web, an international conference series
• Sleepy's multiple worlds - multiple worlds talker

mW could refer to:

• Milliwatt

$M\_\backslash mathrm\{w\}$ could refer to:

• Moment magnitude scale
• Weight average molecular weight

MW | MW | Mw | MW | MW | MW | MW | MW