A green flag has various meanings.

• The Flag of the Great Socialist People's Libyan Arab Jamahiriya was a plain green flag.^[1]
• The Flag of Saudi Arabia has a field of green, which represents Islam.^[2]
• Irish nationalism was traditionally represented with a green flag.^[3] 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.^[4]
• The former Flag of Mauritania.^[5]
• Various green-striped American flags flew during the Revolutionary War, with green representing the 'color of hope'.

• A green flag is part of a set of racing flags and indicates the beginning or resumption of an auto race.
• The actual flags flown in parks and gardens that have received the Green Flag Award.^[6]
• On rail transport in Great Britain and Ireland, green flags are sometimes used (less often than in the past) by railway guards as a signal to engine drivers that they can proceed.

• White flag
• Red flag (disambiguation)
• Action Party (Italy)