MGA can be an abbreviation of:

• The IATA code for Managua International Airport located in Managua, Nicaragua; also known as the Augusto C. Sandino International Airport
• Master of Governmental Administration, a degree program offered by the Fels Institute of Government
• Malagasy ariary, the ISO 4217 code for the currency of Madagascar
• Map Grid of Australia, a mapping system based on the Universal Transverse Mercator coordinate system
• Marriott's Great America (disambiguation), former name of amusement parks
• Matrox, producer of video card components
• Metal Gear Acid, a PlayStation Portable video game by Konami
• Metal Gear Arcade, an arcade video game by Konami
• Midwestern Governors Association, a nonprofit organization of the 12 American Midwest states' governors
• Minnesota Grocers Association, a business alliance
• Monochrome Graphics Adapter
• Monongahela Railway
• Mutual Gains Approach
• MGA Entertainment, a private toy company, who manufacture the world famous Bratz dolls.
• Managing general agent
• Mint Green Army, the football team of St Anne's College, University of Oxford
• The subsidiary of Mitsubishi
• MG MGA, a popular British sports car manufactured between 1955 and 1962 by MG
• Mga (protein), a DNA-binding protein found in S. pyrogenes
• Mga River in Leningrad Oblast, Russia
• Mga, an urban-type settlement in Leningrad Oblast, Russia
• Multi-Generational Architecture - the method of database transactions handling in Firebird and Interbase RDBMS engines, inherited back from their roots in Groton Data Systems.

Mga is an urban locality (an urban-type settlement) in Kirovsky District of Leningrad Oblast, Russia. Population:
The name is almost certainly derived from the identically named Mga River on which it lies (which in turn is probably of Finno-Ugric origin); the suggestion that it comes from the initials of the owner of the land in the 19th century, Maria Grigorievna Apraksin (a member of the same family for which the Apraksin Dvor in St. Petersburg is named), is extremely unlikely.