Ban Thi (Thai: บ้านธิ, pronounced [bâːn tʰíʔ]) is the northernmost district (amphoe) of Lamphun province, northern Thailand.

The district is named after the Thi River, and literally means 'Thi village'.

[2] Neighboring districts are Mueang Lamphun of Lamphun Province to the south and San Kamphaeng of Chiang Mai province to the north.

The district is divided into two sub-districts (tambons), which are further subdivided into 34 villages (muban).

The sub-district of Ban Thi will be the site of the second Chiang Mai Airport.