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

[2] 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.

The mangrove forests in the estuary of the Kapoe River are part of the Ranong Biosphere Reserve.

The district is divided into five subdistricts (tambons), which are further subdivided into 34 villages (muban).

There are five subdistrict administrative organizations - SAO (ongkan borihan suan tambon - o bo to): Kapoe, Muang Kluang, Bang Hin, Ban Na and Chiao Liang.