Rajjaprabha Dam (Thai: เขื่อนรัชชประภา, RTGS: Khuean Ratchaprapha, pronounced [kʰɯ̀a̯n rát.t͡ɕʰā.prā.pʰāː]) or Cheow Lan Dam (เขื่อนเชี่ยวหลาน, RTGS: Khuean Chiao Lan, pronounced [kʰɯ̀a̯n t͡ɕʰîa̯w lǎːn]) is a multi-purpose dam in Ban Cheow Lan, Tambon Khao Phang, Ban Ta Khun District, Surat Thani Province.

Its purpose is electricity generation, irrigation, flood control, and fishing.

King Bhumibol Adulyadej gave the dam the name "Rajjaprabha", meaning 'light of the kingdom'.

[1] Rajjaprabha is a rockfill dam with clay core.

[2] Much of the lake is under the supervision of Khao Sok National Park.