Loei (Thai: เลย, pronounced ), is one of the more sparsely populated provinces (changwat) of Thailand. It lies in the Isan region of upper northeastern Thailand. Neighboring provinces are (from east clockwise) Nong Khai, Udon Thani, Nong Bua Lamphu, Khon Kaen, Phetchabun, and Phitsanulok. In the north it borders Xaignabouli and Vientiane province of Laos.
