What documents are needed for a marriage visa application in Thailand if the Thai marriage certificate is no longer available?

Is her new, married name in the passport and ID card ?

I see a lot of people just go for the retirement non O due to the requirements for marriage. Is it just the extra 400k? Or the other documents that are a pain in the zz ?

More than likely they'll put you on a tourist visa until you go through the hoops of registering your marriage in Thailand. You'll obviously need your official marriage license, a Thai translation of it, a form in Thailand called khor ror 22 and a Thai bank account in your name with 400,000 baht in it. It's a minimum bank balance to maintain your Non-O marriage visa. I have a English form of the requirements I can send to you. Just msg me. 👍

I will focus on your marriage certificate here.. since imo this is possibly the most difficult aspect to get right.. because it involves several steps.....

If you were married overseas.. meaning not in Thailand.. then the first step is to get a copy of the original marriage certificate certified by the Embassy (or sometimes it's a service performed by the Consulate) of the country where your marriage took place.. for most people that's likely to be their home country.. so you may be able to do this in Canada before you leave for Thailand.. however, you could have had a vacation style wedding, which would need to involve a foreign Embassy instead.. but if you are already in Thailand with a home country marriage certificate then things are slightly different.. first step, your overseas marriage certificate has to be authenticated by the relevant country Embassy in Bangkok.. once you have this you can move on to the second step.. which is getting a copy of the original (now already Embassy certified) marriage certificate translated into Thai and getting that translated copy certified by the (Thailand) Ministry of Foreign Affairs (also in Bangkok) .. only then will you have the correct documents to be able to register your marriage at your local Amphur in Thailand.. which is necessary to obtain a Kor Ror 22 (another certificate) from them.. which is a document you will need to support your non-o married visa application at Immigration.. given the complexities and inconvenience involved in this process I'd say it's probably best to engage an agent who knows the ropes and can expedite this for you.. we are in CM and didn't want to waste our time and energy traveling to Bangkok in person.. so we found an agent that specialises in translation services that could do everything for us and produce the certified marriage documents I've outlined here.. this process took them around 2 weeks from start to finish and we agreed to attend the final document collection at the International Convention Center in CM to reduce the wait by a few days.. otherwise it would have been a 3-week wait.. the fee was just over 5,000 baht in total.. and they threw in a translated copy of my passport for good measure.. which wasn't needed by the Amphur to register the marriage but i guess it might come in useful later.. be aware that your Amphur may try to retain the original certified copies instead of simply taking copies of them for their records.. which is outrageous imo since you may need to use them elsewhere in the future.. and you won't want to have to repeat this exercise and incur further unnecessary expense.. i pushed back hard and told our Amphur they could only keep them if they gave me a legal undertaking to return them if i needed them.. or alternatively, agreed to pay an agent the necessary fee to produce another set for me.. and after deliberation and consultation with superiors they backed down and simply took copies which they had us certify as genuine copies!

I have clear knowledge about it and can certainly help you. Please keep in touch since I am busy right now.

Do you have to get married in Thailand.

The non-O visa IS the marriage visa.

If your marriage is already registered in Thailand then you can get the marriage certificate from any amphur office in Thailand.

I suspect you will need to get your Canadian marriage authenticated by the Thai embassy in your home country before you travel. Perhaps another Canadian who has been through the process could weigh in