EGA may stand for

• EGA: estimated gestational age, medical
• Eagle, Globe, and Anchor, the emblem of the United States Marine Corps
• Egyptian German Automotive Company, the Mercedes-Benz manufacturer in Egypt
• Elegant Gothic Aristocrat, a fashion line
• Éléments de géométrie algébrique, a mathematical treatise by Alexander Grothendieck and Jean Dieudonné
• Enhanced Graphics Adapter, a computer display specification
• European Golf Association, whose membership is restricted to European National Amateur Golf Associations, Federations or Unions
• Evolved gas analysis, a type of chemical analysis

Ega may refer to:

• Ega (river), Spain
• Éléments de géométrie algébrique, a standard reference in algebraic geometry.
• Egå, a suburban area of Aarhus, Denmark
• Ega language, an Ivorian language
• Aega (mayor of the palace) or Ega, a 7th-century noble of Neustria and Burgundy
• Tefé, formerly Ega, a city and a municipality in Brazil
• Ega, Portugal in Condeixa-a-Nova municipality, a parish of Portugal
• The Eagle, Globe, and Anchor is the emblem of the United States Marine Corps
• EGA, Evolved Gas Analysis is a method to analyze released gas from a thermal decomposition of a material
• The Enhanced Graphics Adapter was a display specification for mid-1980s to early-1990s PCs.

Egå (English: Oak-stream) is a suburban district and a stream in the Municipality of Aarhus in Denmark. The stream runs north of the city of Aarhus, in the bottom of the flat valley of Egådalen, eventually terminating at the Bay of Aarhus.