Rolea B'ier (Khmer: ស្រុករលាប្អៀរ) is a district (srok) in the center of Kampong Chhnang province, in central Cambodia.

[2] The Kampong Chhnang Airport, built during the period of Democratic Kampuchea (the regime of the Khmer Rouge) lies in Krang Leav commune.

National Road 53, which runs from the provincial capital to Romeas in Tuek Phos district, crosses the district diagonally running from north east to south west.

Numerous smaller tertiary roads run either from the highway or to the nearby national railway line.

The following table shows the villages of Rolea B'ier district by commune.