The Bagley Brook is a small watercourse that flows into the River Severn at Shrewsbury in Shropshire, England.

[3] In present times, the watercourse starts roughly where the Ellesmere Road (the A528) crosses the old course of the Severn,[4] and runs through the marshy area at first in a southeasterly direction, then a southerly direction.

[1] It then runs through a cutting to the east of the Shrewsbury–Crewe railway line, eventually passing between a new housing development ("Ellesmere Grange") and a coal yard.

The water discharges into the Severn at Chester Street, where the Gateway public building is, between Coton Hill and the town centre.

[3] Historically there was a bridge to carry the road over the brook, but the watercourse now flows through a culvert from the north of the Shrewsbury–Chester railway line straight into the river and cannot now be seen at Chester Street.