Nationalities from the following countries (including associated territories) can apply for an UK ETA.
Andorra
Antigua and Barbuda
Argentina
Australia
Austria
Bahamas
Bahrain
Barbados
Belgium
Belize
Botswana
Brazil
Brunei
Bulgaria
Canada
Chile
Costa Rica
Croatia
Cyprus
Czechia
Denmark
Estonia
Finland
France
Germany
Greece
Grenada
Guatemala
Guyana
Hong Kong Special Administrative Region
Hungary
Iceland
Italy
Israel
Japan
Kiribati
Kuwait
Latvia
Liechtenstein
Lithuania
Luxembourg
Macao Special Administrative Region
Malaysia
Maldives
Malta
Marshall Islands
Mauritius
Mexico
Federated States of Micronesia
Monaco
Nauru
Netherlands
New Zealand
Nicaragua
Norway
Oman
Palau
Panama
Papua New Guinea
Paraguay
Peru
Poland
Portugal
Qatar
Romania
Samoa
San Marino
Saudi Arabia
Seychelles
Singapore
Solomon Islands
South Korea
Slovakia
Slovenia
Spain
St Kitts and Nevis
St Lucia
St Vincent and the Grenadines
Sweden
Switzerland
Tonga
Tuvalu
United Arab Emirates
United States
Uruguay
Vatican City