There are 6 Buddhist monasteries and meditation centres in Thailand in our directory that welcome English speakers, across Theravada and Insight traditions. Many offer free or donation-based (dana) teachings and retreats; check each centre's website for dates and guidelines.
Theravada and forest monasteries
Insight (vipassana) centres
First visit? How to stay at a Buddhist monastery. See all centres worldwide. Run a centre? Add it free.