Do I need a re-entry stamp for a multiple entry visa in Thailand?

For a multiple entry visa in Thailand, you do not need a re-entry stamp; you can enter as many times as you like during the visa's validity period. However, it's important to calculate whether the costs and requirements of a multiple entry visa are justified compared to single entry visas, especially since a multiple entry visa has a higher fee and stricter application process. If your visa is still valid, you can re-enter; if it's under an extension, re-entry may not be allowed.