I can't even remember how this collection started...
(current total: 272)

Europe
United Kingdom	England	Scotland	Scotland (Rampant Lion)	Wales	Northern Ireland	Ireland
St. Patrick (Ireland)	Shetland Islands (Scotland)	Yugoslavia	Serbia & Montenegro	Serbia	Croatia	Slovenia
Bosnia (Former)	Bosnia	Macedonia (Former)	Macedonia	Albania	Romania (Former)	Romania
Hungary (State)	Hungary	Bulgaria (Former)	Bulgaria	Greece	Turkey	Cyprus
Armenia	Estonia	Latvia	Lithuania	Poland	Poland (State)	Russia
USSR	Slovakia	Czech Republic	Germany	East Germany	Austria	Austria (State)
Switzerland	Liechtenstein	Luxembourg	Belgium	Netherlands	Friesland	Italy
France	Monaco	Spain (State)	Spain	Portugal	Azores	Vatican City
Ukraine	Ukraine (Trident)	Finland	Sweden	Norway	Denmark	Iceland
European Union	Isle of Man	Belarus	Kosovo	Andorra	Moldova	Georgia
San Marino	Montenegro	Gibraltar	Azerbaijan	Cornwall	Malta
North & Central America
Canada	Newfoundland	P.E.I.	Nova Scotia	New Brunswick	Quebec	Ontario
Manitoba	Saskatchewan	Alberta	British Columbia	Yukon	N.W.T.	Nunavut
Newfoundland Republic	Labrador	Cape Breton	Acadia	Mohawk	First Nations	Greenland
United States	Georgia	Alabama	North Carolina	South Carolina	Tennessee	Mississippi
Virgin Islands (USA)	Conch Republic (USA)	Puerto Rico (USA)	Mexico	Belize	Guatemala	Honduras
El Salvador	Nicaragua	Costa Rica	Panama	Cuba	Jamaica	Haiti
Dominican Republic	St. Kitts & Nevis	Antigua & Barbuda	Dominica	St. Lucia	St. Vincent & the Grenadines	Grenada
Barbados	Montserrat	Trinidad & Tobago	Aruba	Curacao	Netherlands Antilles	Bahamas
Cayman Islands	Bermuda
South America
Brazil	Argentina	Argentina (State)	Patagonia	Chile	Uruguay	Paraguay
Bolivia	Bolivia (State)	Peru (State)	Ecuador	Colombia	Venezuela	Guyana
Suriname
Middle East
Saudi Arabia	Israel	Palestine	Lebanon	Syria	Jordan	United Arab Emirates
Kuwait	Iraq	Iraq (Former)	Iran (State)	Iran	Pakistan	Qatar
Afghanistan	Afghanistan (Former)	Oman	Yemen	Bahrain	Kurdistan
Asia
Japan	South Korea	North Korea	China	Taiwan	Hong Kong	Hong Kong (Former)
Mongolia	Viet Nam	Laos	Laos (Former)	Thailand	Burma	Malaysia
Singapore	Philippines	Indonesia	Sri Lanka	India	Nepal	Tibet
Bangladesh	Bhutan	Cambodia	Kazakhstan	Kyrgyzstan	Uzbekistan	Turkmenistan
Tajikistan	Maldives	Timor Leste	Brunei	South Vietnam
Africa
Morocco	Algeria	Tunisia	Libya (Former)	Egypt	Ghana	Nigeria
Chad	Ethiopia	Ethiopia (State)	Eritrea	Somalia	Kenya	Tanzania
Congo (Former)	Zaire	Zambia	Zimbabwe	Angola	Botswana	Mozambique
Namibia	South Africa	Uganda	Senegal	Guinea	Central African Republic	Sudan
Niger	Rwanda	Mali	Cape Verde	Gabon	Cote D'Ivoire	Madagascar
Togo	Comoros	Burkina Faso	Mauritius	Burundi	Djibouti	Dem. Rep. of the Congo
Gambia	Sierra Leone	Cameroon	Guinea Bissau	Benin	Swaziland	Liberia
Lesotho	Dem. Rep. of the Congo (Former)	Malawi (Former)	Seychelles	Mauritania
Oceania
Australia	Australia (Naval Ensign)	New Zealand	Fiji	Solomon Islands	Papua New Guinea	Kiribati
Nauru	Micronesia	Tonga	Tuvalu	Samoa	Vanuatu	Marshall Islands
Miscellaneous
United Nations	Pride Flag	CN Marine Atlantic