Blue flag or Blue Flag may refer to:
- Sport and recreation
- Blue Flag beach, a beach or marina that meets certain quality standards
- Blue Flag, the flag of Chelsea F.C.
- Blue flag, a particular Flag#Swimming flags
- Blue flag, a particular Racing flags#Blue flag
- Botany
- Larger Blue Flag or Iris versicolor, a type of iris
- Slender Blue Flag or Iris prismatica, a type of iris
- Transport
- Blue flag, a particular Flag#Railway flags in railway use.
- Blue sign used by European waterways vessels passing on the starboard side
- Military
- Blue Flag (Israeli Air Force exercise), the name of an Israeli Air Force exercise
- Blue Flag (United States Air Force exercise), the name of a United States Air Force command and control exercise
- Other
- Blue Flag (manga), a manga series by KAITO.
- "The Blue Flag", World War I song composed by Carrie Jacobs-Bond
- Blue Flag, common representation of the street gang Crips
See also
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