Do I need to register my US marriage in Thailand for my wife's marriage visa?

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To get the KR22, you’ve got to notarize your US marriage cert, get it authenticated (state + US Dept of State), legalized at the Thai Embassy in the US, then once in Thailand translate it, certify it at Chaeng Wattana, and finally register at your local Amphur. I forgot to do all this before coming here and it gave me a big headache, so definitely sort it out first!

If you work through the bones of what i just posted.. you should get a reasonable understanding of the process.. but it's worth checking if the Thai Embassy nearest to you in the U.S. is able to offer a translation and certification service.. so you can also get this done before you travel.. they may say it has to be done by (or can only be done by) the MoFA in Thailand.. I'm not sure about this aspect.. but if it's feasible to do it state side it will save you a lot of time and energy attending to it here 👍

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 before you leave for Thailand.. however, you could have had a vacation style wedding of course, which would need to involve a foreign Embassy in the process.. but if you are already in Thailand then things are slightly different.. first step, your overseas marriage certificate has to be authenticated by the relevant country Embassy in Bangkok before 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 the translated copy certified by the 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.. 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!