The Ver is a 28 km (17 mi) long chalk stream in Hertfordshire, England. It is a tributary of the River Colne.

Chalk streams are rivers that rise from springs in landscapes with chalk bedrock. Since chalk is permeable, water percolates easily through the ground to the water table and chalk streams therefore receive little surface runoff. As a result, the water in the streams contains little organic matter and sediment and is generally very clear.