The Nam Mae Lai (Thai: น้ำแม่หล่าย, in Thai pronounced as /náːm mɛ̂ː làːj/) is a river in Phrae Province of Thailand.[1] It is a tributary of the Yom River, part of the Chao Phraya River basin. The Nam Mae Lai flows into the Yom at 18.22°N 100.1906°W, next to the village of Ban Bun Charoen.[2]