The Eye Brook is a watercourse in the East Midlands of England and a tributary of the River Welland.

Near where it crosses the A47, it starts to form the county boundary between Leicestershire and Rutland, with Belton-in-Rutland to the north, and Allexton to the south.

Shortly after the reservoir outfall, it joins the River Welland (here forming the border with Northamptonshire).

[3] In 2016, the overall classification of the Eye Brook was "Poor" under the Water Framework Directive, having shown a significant decline in ecological condition since 2013.

Reasons for this include the effect of poor livestock management and treated sewage effluent on plant life and the presence of the invasive Signal crayfish.