You can check if you need an Irish visa on the website of the Irish Naturalisation and Immigration Service (INIS).
Please note that Ireland is not party to the Schengen Agreement, and a Schengen visa or residence permit does not entitle you to travel to Ireland without a visa.
Unless you qualify for the short stay visa waiver programme, a valid UK visa does not entitle you to travel to Ireland without a visa.
You DO NOT NEED an entry visa for Ireland if you are a passport holder of one of these countries:
Andorra
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Guyana
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Saint Kitts and Nevis
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Antigua and Barbuda
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Honduras
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Saint Lucia
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Argentina
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Hong Kong (Special Administrative Region)
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Saint Vincent and the Grenadines
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Australia
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Hungary
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Samoa
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Austria
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Iceland
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San Marino
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Bahamas
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Israel
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Seychelles
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Barbados
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Italy
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Singapore
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Belgium
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Japan
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Slovak Republic
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Belize
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Kiribati
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Slovenia
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Bolivia
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Latvia
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Solomon Islands
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Botswana
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Lesotho
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South Africa
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Brazil
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Liechtenstein
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South Korea
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Brunei
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Lithuania
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Spain
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Bulgaria
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Luxembourg
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Swaziland
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Canada
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Macau (Special Administrative Region)
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Sweden
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Chile
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Malaysia
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Switzerland
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Costa Rica
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Maldives
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Taiwan
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Croatia
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Malta
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Tonga
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Cyprus
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Mexico
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Trinidad and Tobago
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Czech Republic
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Monaco
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Tuvalu
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Denmark
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Nauru
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United Kingdom, British Overseas Territories and Crown Dependencies
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Dominica
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Netherlands, The
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United States of America
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El Salvador
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New Zealand
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Uruguay
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Estonia
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Nicaragua
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Vanuatu
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Fiji
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Norway
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Vatican City
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Finland
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Panama
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France
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Paraguay
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Germany
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Poland
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Greece
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Portugal
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Grenada
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Romania
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Guatemala
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