Do I need a Thai driving or motorcycle license to buy a moped in Bangkok?

To purchase a moped in Bangkok, it's not strictly necessary to show a driving license, as sellers may not ask for it initially. However, if you wish to register the moped in your name, you will need a Thai motorcycle license and a Certificate of Residency. If you're on a tourist visa, acquiring these can be challenging. If you already hold a full motorcycle license and an International Driving Permit, you can drive but need to convert your license to a Thai one within 90 days.