Krouch Chhmar District (Khmer: ស្រុកក្រូចឆ្មារ) is a district (srok) located in Tbong Khmum Province, Cambodia. The district capital is Krouch Chhmar town located around 35 kilometres north east of the provincial capital of Kampong Cham by water. The Mekong River forms western and northern borders of the districts and includes the Mekong island of Koh Pir in its area.