Pa Sak (Thai: ป่าสัก) is a tambon (subdistrict) of Mueang Lamphun District, in Lamphun Province, Thailand.

In 2019 it had a total population of 14,385 people.

[1] The tambon is subdivided into 18 administrative villages (muban).

The whole area of the subdistrict is covered by the subdistrict municipality (Thesaban Tambon) Pa Sak (เทศบาลตำบลป่าสัก).

This Lamphun Province location article is a stub.