Can I apply for a Non-O Dependent Visa in Laos if I can't get a letter from my wife's employer?

You can try contacting them. I would assume they can speak English.

Vientiane

(+856) 21 6 (between 13.30-16.30 hrs only)

Savanaket

(+856) 41 3

I don't think they are out anything by trying, I mean the worst that can happen is they won't accept the application and he could get a single entry tourist visa come back and try to get the documentation correct to go again.

@Len ****************

i don't see where it's gotta be certified by their consulate for getting a 90 day Non-O in Vientiane or Savannakhet

BUT they already posted that the HR director for the company his wife works for will not issue the letter. That's why I said to have her write one instead. I mean all they're wanting is a 90 day single entry Non-O and then get the year extension inside the country

That's the documents you need if you want to piggy back to your spouse's non immigrant B visa. Your marriage certificate should be authenticated/certified by your embassy before applying for a non immigrant o visa. also you need to ask your spouse to request for an "endorsement letter" from his/her employer that says they are aware of you being under his/her visa. (edit: I didn't noticed that Tod already mentioned the letter :)... ) my bad)