A badge is a device or accessory, often containing the insignia of an organization, which is presented or displayed to indicate some feat of service, a special accomplishment, a symbol of authority granted by taking an oath (e.g., police and fire), a sign of legitimate employment or student status, or as a simple means of identification. They are also used in advertising, publicity, and for branding purposes. Police badges date back to medieval times when knights wore a coat of arms representing their allegiances and loyalty.

Badge may refer to:

• Badge, a display indicating a special accomplishment, or as a symbol of authority:
  • Access badge, a credential used to gain entry to an area
  • Digital badge, an indicator of accomplishment, skill, quality or interest in various learning environments
  • Heraldic badge, a display of allegiance to a royal figure
  • Web badge, a small image used on websites to promote a web standard, product, or terms of service
  • Pin-back button, in the United Kingdom
  • Rebadging, the practice of applying a new brand or trademark to an existing product