As of July 31st, 2021, the Ministry of Health updated the Protective Measure regarding the conditions of entry into the Czech Republic.
The rules for entering the territory of the Czech Republic and quarantine measures are defined by the Ministry of Health (pdf, 641 kB). List of countries with a low, medium and high risk of COVID-19 transmission is HERE (pdf, 443 kB). List of countries with an extreme risk of COVID-19 transmission is HERE (pdf, 359 kB). Information regarding entry to other countries is the responsibility of the embassies in the countries of destination and the Ministry of Foreign Affairs. Quarantine measures and RT-PCR test conditions are the responsibility of the Ministry of Health.
The activities of diplomatic missions of the Czech Republic are gradually resumed. Depending on the epidemiological situation, the conditions for entry into the Czech Republic will also be gradually relaxed. More detailed information regarding the stay of third country nationals in the Czech Republic can be found here.
More information in English can be found here: https://www.mvcr.cz/mvcren/article/coronavirus-information-of-moi.aspx.