I am presently on an OA visa using a marriage extension which needs renewing in October. I will be getting divorced, and would like to convert to an O visa. My questions are: How do I do that, and is it possible without leaving the country?

Thanks guys, I would appreciate factual knowing only, and not opinions.

You can't convert in-country.  You can;

- leave and re-enter visa exempt, hopefully you do NOT have a re-entry permit.

- make sure you have THB800k in your bank.

- at immigration apply for single non-O based on retirement, gives a 90 day permission to stay.

- in the last 30 days apply for extension of stay based on retirement. 

I did PM you a comprehensive Guideline document on how to do exactly that > it outlines the complete process (including all options) of getting rid of your current Non Imm O-A Visa or extension, and then apply for a Non Imm O Visa for reason of retirement. 

This will be better in the Visa Forum.

29 minutes ago, Red Phoenix said:

I did PM you a comprehensive Guideline document on how to do exactly that > it outlines the complete process (including all options) of getting rid of your current Non Imm O-A Visa or extension, and then apply for a Non Imm O Visa for reason of retirement. 

Is this top secret stuff, pm me later.

1 hour ago, Mansell said:

I am presently on an OA visa using a marriage extension which needs renewing in October. I will be getting divorced,

Keep in mind the extension terminates upon divorce. It won't continue to be valid until October if divorced earlier.