Pak Phayun (Thai: ปากพะยูน, pronounced [pàːk pʰā.jūːn]) is a district (amphoe) of Phatthalung province, southern Thailand.

The district was established in 1896 as part of the thesaphiban administrative reforms, originally subdivided into 17 tambons.

[1] The gathering of edible bird's nests is a significant contributor to the local economy.

The state auctions off concessions to private firms for the right to collect bird's nests, largely in Ko Mak Sub-district.

The province earned 450 million baht in the latest five-year concession auction for nests harvested from caves, primarily on Ko Rangnok ('Bird's Nest Island'), down from the 100 million baht a year earned in previous auctions.