Visas are not required by visitors from the following countries for visit up to 90 days in a 6 month period:
All European Union Countries, Albania, Andorra, Antigua and Barbuda, Argentina, Australia, Austria, Bahamas, Barbados, Bosnia and Herzegovina, Brazil, Brunei, Canada, Chile, Colombia, Costa Rica, Dominica, El Salvador, Georgia, Grenada, Guatemala, Holy See, Honduras, Hong Kong, Israel, Japan, Kiribati, Macao, Macedonia, Malaysia, Marshall Islands, Mauritius, Mexico, Micronesia, Moldova, Monaco, Montenegro, New Zealand, Nicaragua, Palau, Panama, Paraguay, Peru, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines, Samoa, San Marino, Serbia, Seychelles, Singapore, South Korea, Switzerland, Taiwan, Timor-Leste (East Timor), Tonga, Trinidad and Tobago, Tuvalu, United Arab Emirates, United States, Uruguay, Vanuatu, Vatican City and Venezuela.
If you have a Schengen visa for any other country in the Schengen area then your visa is valid for the Czech republic.
Visa requirements for Czech
Foreign embassies in Czech Republic
Czech Republic is a member of the Schengen Countries