Are there any countries that stamp their citizens' passports upon re-entry?

There are a few countries that stamp their citizens' passports upon re-entry. The practice is rare and not common, but it does occur in some countries. Most countries do not stamp their citizens' passports when they re-enter the country. Instead, the citizens are allowed to enter the country without any additional documentation.

One country that stamps its citizens' passports upon re-entry is South Korea. South Korean citizens are required to obtain a re-entry permit if they plan to leave the country for more than 1 year. When they return to the country, their passport is stamped with the re-entry permit.

Another country that stamps its citizens' passports upon re-entry is Japan. Japanese citizens are required to have a valid passport when leaving the country, and when they return, their passport is stamped with the date of re-entry.

It is important to note that each country has its own rules and regulations regarding passport stamping. Some countries may require a stamp upon re-entry for citizens, while others may not. It is always a good idea to check with the embassy or consulate of the country you plan to visit to find out their specific rules regarding passport stamping.