What visa should I apply for to enter Thailand before marrying a Thai citizen?

Perfect advice as usual.

It all depends on how fast you can get your shit together to get married and then to apply for the initial 90 day Non-O visa based on marriage

IF you think you can do it quickly you could come in on a 30 day visa exempt entry and if you needed more time you could get a 30 day extension on that. SO that means you'd have to get married and get your money into the thai bank account in your name only with enough time left on your entry stamp/extension to apply for the in country Non-O visa (most offices require 15 days left on your stamp to apply)

OR

If you want to give yourself some 'breathing room', get a single entry tourist visa from the thai consulate in your country before you come here. That would stamp you in for 60 days when you arrive and you could get a 30 day extension on that as well so a total of 90 days.

With the ongoing covid shit show I would say get the tourist visa to give you the maximum amount of time you can get to get married, get the funds in place and apply for the 90 day non-O based on marriage

I did it (marriage) last year entering 30 day visa exempt entry with one 30 day extension. Just about managed it as the Embassy wasn't open for business until 3 weeks before my departure. I didn't extend beyond that but my timings under Covid conditions show it can be done without a visa because when married I could have got an extension based on visiting Thai family if I needed it.

I assume you will be leaving Thailand soon ..if not already.

Just when are you planning to reenter Thailand?

When will you be getting married to a Thai?

Entering with a tourist visa then transitioning to an Ed Visa to learn Thai language would be a good plan to consider as you prepare marriage plans

Are you still in Thailand?

As your prior post of September 15, 2021 says you were applying for the second 90 days extension of the STV visa.

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