Khong Chiam (Thai: โขงเจียม, pronounced [kʰǒːŋ tɕīam]) is the easternmost district (amphoe) of Ubon Ratchathani province of Thailand.

On 1 January 1957 the three tambons Khong Chiam, Huai Yang, and Pho Klang were split off from Khong Chiam to form the Ban Dan minor district (king amphoe).

[3] It is thought that the name Khong Chiam comes from the word khong (โขง) meaning 'chief of elephants' or 'herd of elephants' (khlong; โขลง in Thai) and chiam (เจียม) from the word chiang (เจียง), which means 'tribute'.

[4] Neighboring districts are (from the south clockwise) Sirindhorn, Phibun Mangsahan, and Si Mueang Mai.

The Kaeng Tana and Pha Taem national parks are in Khong Chiam District.