Li (Thai: ลี้, pronounced [líː]) is the southernmost district (amphoe) of Lamphun province, northern Thailand.

[1] Li district is believed to have been an iron smelting site until the middle years of the Ayutthaya Kingdom (the reign of King Borommatrailokkanat), based on excavated ancient metal furnaces, about 2,000 years old in Mae Lan sub-district.

Presumably that in the period 327–361 BC or 4th century Buddhist (before the rise of Hariphunchai Kingdom about 1,000 years ago).

[3]: 7 The district is divided into eight sub-districts (tambons), which are further subdivided into 99 villages (mubans).

The missing number 7 belonged to the now defunct Ban Phai Subdistrict.