Can I apply for a Thai marriage visa if married to a Thai citizen outside Thailand?

Jumped through all these hoops myself.. non Thai marriage certificate has to be translated into Thai and stamped by MFA in Thailand.. but original also has to be stamped by embassy of country of marriage.. we used an agent in CM to handle it all.. so as to avoid having to fly down to Bankgkok ourselves.. they included a translated copy of my passport in case of need as well.. and was well worth the cost given the saving on flights etc.. one of the few occasions that agents really make sense imo.. process took around 2-3 weeks.. once documents are to hand marriage needs to be registered at your local Amphur and certificate of registration obtained.. I'd suggest you get 3-4 original stamped copies.. you need this to apply for a 'non-o' visa based on marriage.. you also need it to apply for a yellow book and a pink ID card later.. be aware some Amphurs try to retain your original stamped certificate of translation.. i told mine they could have it if they reimbursed me for the cost of it.. and they eventually backed down and took a copy they certified for themselves.. but it took some serious haggling to achieve that! Clearly different provinces and different amphurs have their own 'rules' but that's the gist of it.. good luck!

How does it work if someone is here on a non O dependant visa , but they work for a foreign company which is abroad? They can still receive a salary but just pay the taxes for money coming into Thailand?

I got one married in the US and only registered our marriage here in Thailand

Immigration told me about a week ago that I can do that just make sure all your documents ie marriage certificate is in Thai

You have to register the Marriage with Thai Authorities. Con tact your local embassy.

UK marriage needs a stamp and translation. We did it using an agent in London. Mrs flew to Thailand to get new ID card and Koror 3. We are still in the UK but good to go when we do what you are doing in a year or so time.

You can translate your documents and stamp them in ministry of foreign affairs in laksi if you brought your marriage certificate, then bring them to amphur to get Thai marriage certificate from there you can convert your visa to non-o since married to Thai

Would recommend contact UK embassy in Bangkok to get confirmation

Here you go...