Can I use a foreign bank statement for a Non-O Marriage visa extension in Thailand?

No it has to be a bank in Thailand and a 12 month bank statement

Well its quite straightforward if your applying for non o 90 day outside the country its ok, if its a visa ext 12 months at your local immigration office then its a local bank statement

You’ll need to have the 400k in a Thai bank in your name only avoid Bangkok Bank

Yes you can use foreign bank statement for initial non-o outside of Thailand BUT not inside . All extensions are based on Thai bank accounts

I am a bit of a novice myself at this but October I came out to live in Thailand after getting my non. O, visa due to being married to a Thai lady.

When the first week I went to her bank and successfully after showing passport my 90 day visa and my wife sort of documentation of marriage so-and-so on. I opened a bank account. They knew it was to get a one year visa, but the bank has to mature for 2 months before I can apply and some say it's right. Some say it's wrong, but they have actually frozen the four hundred thousand thai backs or the ten k that I transferred with yes to that bank.for 6 months but my situation was to always have the money I pull it in to forget about it, because some people open up two bank accounts at the moment.It is perfect because they freeze the four hundred thousand but you can put more money in and pay with the q.R like most thai people do hope that I was giving you some idea.The bank obviously says it was requirement for me to get the paperwork.I'm assuming that's the statements and the certificate to get the visa