National flags

• The current flag of Libya is a plain green flag.
• Irish nationalism was traditionally represented with a green flag. The current flag of Ireland is a tricolour with green representing the Irish Catholics, orange representing the Irish Protestants, and white in the middle to represent peace.
• In George Orwell's novel Animal Farm the farm hoisted a plain green flag.

Other

• Green Flag is the name of a motoring assistance company in the UK
• The waving of a green flag indicates the beginning or resumption of an auto race.
• Green Flag award is a mark of conservation effort in the UK
• The Green Flag is a novel written by Sir Arthur Conan Doyle, first published in 1900.