Kapoe (Thai: กะเปอร์, pronounced [kā.pɤ̄ː]) is a district (amphoe) of Ranong province, southern Thailand.

Neighboring districts are (from the north clockwise) Mueang Ranong of Ranong Province, Phato of Chumphon province, Chaiya, Tha Chang and Ban Ta Khun of Surat Thani province, and Suk Samran of Ranong. To the west is the Andaman Sea.

The southeastern part of the district is part of the Khlong Nakha Wildlife Sanctuary. The mangrove forests in the estuary of the Kapoe River are part of the Ranong Biosphere Reserve.

The district is divided into five sub-districts (tambons), which are further subdivided into 34 villages (muban). Kapoe itself is a township (thesaban tambon) and covers parts of the tambon Kapoe. There are four tambon administrative organizations (TAO) responsible for the non-municipal areas.

No. Name Thai Villages Pop. 1. Muang Kluang ม่วงกลวง 4 3,772 2. Kapoe กะเปอร์ 10 5,521 3. Chiao Liang เชี่ยวเหลียง 7 1,921 4. Ban Na บ้านนา 8 3,333 5. Bang Hin บางหิน 5 4,237