MWA may refer to:
* Machas With Attitude, Indian hip hop group
* Mandatory Work Activity, UK
* Married Women's Association, a British women's organisation
* May Week Alternative, a student charity at University of Cambridge
* Metropolitan Waterfront Alliance, nonprofit organization that advocates for the NY-NJ waterfront, USA
* Military animal, or Military working animal
* Modern Woodmen of America
* Mongo Wrestling Alliance, an animated comedy on Adult Swim
* Munitions of War Act 1915, UK
* Murchison Widefield Array, radio astronomy array in Western Australia
* Muslim Women’s Association, an Australian organization for Muslim women
* Mystery Writers of America
* Modern Standard Arabic, also called Modern Written Arabic, the written standard variety of Arabic.
* Veterans Airport of Southern Illinois near Marion, FAA code MWA
* Midwest Airlines, defunct airline that merged into Frontier Airlines in 2010.
