MWG may refer to:

• Milky Way, the "Milky Way Galaxy"
• Metadata Working Group, a company consortium to advance the interoperability of metadata stored in digital media
• Manhattan Waterfront Greenway
• Military World Games
• meters, water gauge (m.Wg)

• Public Law 99-185
• Public Law No. 110-229
• Public law (United States)
• Public Law (United States)
• Public Leadership Education Network
• Public Ledger (disambiguation)
• Public ledger (London)
• Public lending rights
• Public Liberty Radio
• Public libraries in Ontario
• Public Libraries (journal)
• Public Libraries of New Zealand
• Public Library Advocacy
• Public library advocacy
• Public Library District of Columbia
• Public library (journal)
• Public library movement
• Public Library of Des Moines
• Public Library of Enid and Garfield County
• Public Library of Lleida
• Public Library of Pichilemu
• Public Library of Science Journals
• Public library of science journals
• Public Library of Science ONE
• Public License