Wigg Island is a Local Nature Reserve near Runcorn in Halton, Cheshire, England. It lies between the River Mersey and the Manchester Ship Canal.
During the Second World War it was a centre for the production of mustard gas as Wiggs Works East, then Randles. After the war it was operated by ICI. Production ended in the 1960s.
The nature reserve covers 57 acres and is used by birdwatchers.There is a visitor centre and a wind turbine. It is reached via a swing bridge over the Manchester Ship Canal. The site was heavily contaminated and had to be cleaned up before use as a nature reserve