Do I need an appointment to get a certification for my wife's Thai passport from the Ministry of Foreign Affairs?

You don’t always need an appointment, but it depends on which office you go to. The easiest way:

1. Your wife should go herself (Thai citizen = much faster).

2. Bring her Thai ID card + passport (original + copies).

3. Go to the Ministry of Foreign Affairs – Legalization Division (Chaeng Wattana in Bangkok, or a regional office).

4. Fill out the certification/legalization request form there.

5. Submit and pay the fee (normal or express service available).

If she goes in person, it’s usually straightforward and faster than having a foreigner handle it. Some offices allow walk-in, but Bangkok can require or prefer appointments depending on workload.

Pro tip: Early morning = fastest processing, and express service can be same day or next day.