Masa is Spanish for dough. Although the word is mostly used to refer to any kind of dough, in some regions (Mexico, parts of Central America and the American South West) it is often short for masa de maíz, a maize (corn) dough made from freshly prepared hominy. It is used for making corn tortillas, tamales, pupusas, and many other Latin American dishes. The dried and powdered form is called masa harina, masa de harina, and sometimes Maseca, the name of a leading commercial brand. It is reconstituted with water before use. Masa is not to be confused with masarepa, masa de arepa, or masa al instante, a type of unnixtamalized, soaked, and cooked cornmeal used to make arepas. Masa de trigo is Spanish for wheat flour dough. It is also used for making wheat tortillas and other breads and pastries.

Masa or MASA may refer to:

• Masa, type of dough made from corn
• Masa (musician), stage name of a Japanese musician
• Masa (restaurant), upscale restaurant in New York City
• Masa's Wine Bar & Kitchen, Michelin-rated restaurant in San Francisco, California
• Masa (land), Masa or Masha was also a land to the west of Hatti in Late Bronze Age Anatolia
• Masa, Estonia, village in Pihtla Parish, Saare County, Estonia
• MASA (company), former bus manufacturer in Mexico
• Mexicano Aeronáutica y Spacial Administración, fictional aerospace agency depicted in the South Park episode "Free Willzyx"
• MASA Israel Journey, umbrella organization based in Israel
• Masa, a term for month in Hindu calendar
• Matti (disambiguation), a Finnish male Christian name, a nickname of which is Masa.
• Mines African Staff Association, a defunct Northern Rhodesian trade union
• Masa languages, a group of Chadic languages