Widespread from Cornwall to Kent and north to Westmorland and North Yorkshire. There are isolated records from Scotland (Fifeshire and Moray (the river Spey, near Fochabers; Shaw, 1998)). Also from the east coast of Ireland, and the Channel Islands.
Overseas, the wasp occurs in Europe (including Norway, Sweden, Finland, Denmark, Belgium, France, Spain, Germany, Italy, Poland, Hungary, former Yugoslavia and Greece), north Africa, and Asia (including Russia (Daghestan), Manchuria, Korea and Japan). There have been some introductions into the USA.