Krouch Chhmar District () is a district ("srok") located in Tboung 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. Not surprisingly, communities in this isolated district are mostly clustered along the banks of the river and boats are an important form of transport.