Black (Sable) edit
- Black flag
- Australian Aboriginal flag
- Flag of Afghanistan
- Agender pride flag
- Flag of Albania
- Civil Ensign of Albania
- Naval Ensign of Albania
- Flag of Alphen aan den Rijn
- Flag of Amapá
- Flag of Amsterdam
- Flag of Angola
- Flag of Antigua and Barbuda
- Asexual pride flag
- Flag of Arkhangelsk Oblast
- Flag of the Armenian Apostolic Church
- Aromantic pride flag
- Flag of the Chief of Navy of Australia
- State Flag of Austria
- Flag of the Bahamas
- Civil Ensign of the Bahamas
- Naval Ensign of the Bahamas
- Flag of Barbados
- Naval Ensign of Barbados
- Flag of Basel-Stadt
- Flag of Belgium
- Civil Flag and Ensign of Belgium
- State Ensign of Belgium
- Army Flag of Belgium
- Naval Ensign of Belgium
- Air Force Ensign of Belgium
- Royal Standard of Belgium
- Flag of Belize
- Flag of Berlin
- Flag of Bhutan
- Flag of Bolivia