Spennells Valley is a local nature reserve in south-east Kidderminster, in Worcestershire, England.
It was declared a local nature reserve (LNR) in 1995, and is owned and managed by Wyre Forest District Council.
The reserve, area , is situated along the banks of Hoo Brook. It is a link between Wilden Marsh (a nature reserve of Worcestershire Wildlife Trust) to the south-west and the upper Hoo Brook pools to the north-east.
There is dry woodland, damp woodland and marshland. In the damp woodland is alder, willow and black poplar. There is a waymarked boardwalk trail through the reserve.
The reserve is being extended to include part of a neighbouring sports field. It involves the creation of new ponds; it is expected that the project (underway in 2020), which is run in conjunction with the Environment Agency, will increase the biodiversity of the area of Hoo Brook.