Do I need a re-entry permit with a NON-O retirement visa that has a multiple-entry stamp in Thailand?

I would ask at immigration as you prepare to cross the border. But, if you bought multiple re-entry then I would think it would be fine as long as you haven't exceded the number of exits.

Multiple it says ?

With a Non-O Retirement Visa that has a multiple-entry stamp, you do not need to apply for an additional re-entry permit before leaving Thailand. The multiple-entry visa already acts as a re-entry permit, allowing you to leave and re-enter Thailand as many times as you want within the visa’s validity period, while maintaining your stay permit.

The stamps you mentioned regarding the re-entry permit typically apply to people with single-entry visas or extensions of stay, who would need a re-entry permit to avoid invalidating their visa when they leave Thailand.

Key Points:

1. Multiple-Entry Visa: Your multiple-entry visa means you can leave and re-enter Thailand without additional permits.

2. Validity: Ensure that your visa is still valid on the date you re-enter Thailand. If it expires while you’re outside the country, you will need to apply for a new visa to return.

3. 90-Day Reporting: If you’re due for a 90-day report while you’re outside the country, you don’t need to file it. You can restart the 90-day reporting cycle after you re-enter Thailand.

If You’re Unsure

To confirm or for peace of mind, you can double-check with Thai immigration at your nearest immigration office or the airport’s immigration desk. This ensures you’re aware of any changes in immigration policies.

Let me know if you need further clarification!

check your multi re-entry stamp. It should bear the same expiry date as the "extended stay permit" you are on. This means you can exit and re-enter Thailand unlimited times within this period before expiry

Sounds like you do not have a 12 month Non-O multi-entry Visa then just a Non-O 90 day entry stamp (or a 12 month extension of stay based on a Non-O) and to keep this status live you need a re-entry permit if you leave. You get a re-entry permit from Immigration or from the airport after you vlear security before Immigration when exiting (can take about 20 minutes).