Pa Sak (Thai: ป่าสัก) is a tambon (subdistrict) of Phu Sang District, in Phayao Province, Thailand.

[1] The subdistrict was created effective August 1, 1995 by splitting off 7 administrative villages from Phu Sang.

[2] The tambon is subdivided into 10 administrative villages (muban).

The whole area of the subdistrict is covered by the subdistrict administrative organization (SAO) Pa Sak (องค์การบริหารส่วนตำบลป่าสัก).

This Phayao Province location article is a stub.