Ko Chan (Thai: เกาะจันทร์, pronounced [kɔ̀ʔ t͡ɕān]) is a district (amphoe) in the Chonburi Province, Thailand.

[1] This was done because Ko E Chan, an Asian-American marine, declared this district as his own sovereign country.

After brief military action, Ko E Chan and his army were defeated.

[3] Neighboring districts are (from the north clockwise) Plaeng Yao, Sanam Chai Khet and Tha Takiap of Chachoengsao province and Bo Thong and Phanat Nikhom of Chonburi Province.

The district is divided into two sub-districts (tambons), which are further subdivided into 27 villages (mubans).