I lent someone 30000 thb. He returned 23,000 to me, but I'm still waiting for the 7,000. If he gives me a deadline for the THB 7,000 and he doesn't repay, can I get the police involved or will they laugh at me?

I'd personally let it go and chalk it up to experience, and just be pleasantly surprised if he returns it.

Lending money is the easiest way to lose the friend and the money - it rarely turns out well. If someone asks me for a loan if its a small amount I'll give it and not bother asking for it back, if its for an amount that I will care about if I do not get it back then it will always be a hard no.

Unless he signed a loan agreement with you then I doubt any legal avenue will be open to you.

17 minutes ago, Adrian78 said:

I lent someone 30000 thb. He returned 23,000 to me, but I'm still waiting for the 7,000. If he gives me a deadline for the THB 7,000 and he doesn't repay, can I get the police involved or will they laugh at me?

I did. But not for a loan, it was a dodgy vendor who botched a repair and promised to replace the item.

After a couple of broken promises, I got the police involved. He met the next deadline.

With a loan, I imagine the landscape will be somewhat different.

Maybe make it easier for him, a thousand a week. Forget the police

Did you lend money to a foreigner or a Thai? And what proof do you have that it actually happened, and what were the terms of the loan?