Some countries taking part in the London 2012 Olympics are: U.S.A, Haiti, Jamaca, Cuba, England.
These countries have qualifying athletes:
Afghanistan
Albania
Algeria
Andorra
Angola
Antigua & Barbuda
Argentina
Armenia
Australia
Austria
Azerbaijan
Bahamas
Bahrain
Barbados
Belarus
Belgium
Bermuda
Bolivia
Bosnia & Herzegovina
Botswana
Brazil
British Virgin Islands
Bulgaria
Burundi
Cameroon
Canada
Cayman Islands
Chile
China
Colombia
Congo
DR Congo
Costa Rica
Côte d'Ivoire
Croatia
Cuba
Cyprus
Denmark
Djibouti
Dominica
Ecuador
Egypt
El Salvador
Eritrea
Estonia
Ethiopia
Fiji
Finland
France
Gabon
Georgia
Germany
Ghana
Great Britain
Greece
Grenada
Guatemala
Guyana
Haiti
Hong Kong
Hungary
Iceland
India
Indonesia
Iran
Ireland
Israel
Italy
Jamaica
Japan
Jordan
Kazakhstan
Kenya
North Korea
South Korea
Kuwait
Kyrgyzstan
Latvia
Lebanon
Liberia
Libya
Lithuania
Luxembourg
Malaysia
Malta
Mexico
Moldova
Mongolia
Montenegro
Morocco
Mozambique
Namibia
Netherlands
New ZealandNigeria
Norway
Oman
Pakistan
Panama
Peru
Philippines
Poland
Portugal
Puerto Rico
Qatar
Romania
Russia
Saint Kitts & Nevis
Saint Lucia
Samoa
San Marino
Saudi Arabia
Senegal
Serbia
Singapore
Slovakia
Slovenia
South Africa
Spain
Sudan
Sweden
Switzerland
Syria
Chinese Taipei
Tajikistan
Tanzania
Thailand
Trinidad & Tobago
Tunisia
Turkey
Turkmenistan
Uganda
Ukraine
United States
Uruguay
Uzbekistan
Venezuela
Vietnam
Virgin Islands
Zambia
Zimbabwe
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There are 197 qualified nations competing in the 2012 Olympic games. However, it is estimated that 204 nations will be competing (dependent territories are included as countries).