Li River (Thai: แม่น้ำลี้) is a river in Thailand with a length of 210 kilometres (130 mi). It runs through Li District and Thung Hua Chang in Lamphun Province, Thailand. It is a tributary of the Ping River. It merges into the Ping River on the left at Chom Thong District in Chiang Mai Province.

18°26′N 98°42′E / 18.433°N 98.700°E / 18.433; 98.700