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

This disambiguation page lists articles associated with the title Blue flag.
If an internal link led you here, you may wish to change the link to point directly to the intended article.

• Bonnie Blue Flag

This disambiguation page lists articles associated with the title Blue flag.
If an internal link led you here, you may wish to change the link to point directly to the intended article.