Bilsteinbach
{{short description|River in Germany}}
{{More citations needed|date=November 2024}}
{{Expand German|topic=geo|date=October 2011|Hirschberger Bach}}
{{Infobox river
| name = Bilsteinbach
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| mouth_location = Schorenbach
| mouth_coordinates = {{coord|51.4510|N|8.3247|E|source:wikidata|display=it}}
| progression = Schorenbach→ {{RWester}}
| subdivision_type1 = Country
| subdivision_name1 = Germany
| subdivision_type2 = State
| subdivision_name2 = North Rhine-Westphalia
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Bilsteinbach, in its lower{{Citation needed|date=November 2024}} course named Hirschberger Bach, is a river of North Rhine-Westphalia, Germany. It is 9km long.{{cite web |title=Gewässerverzeichnis des Landesamtes für Natur, Umwelt und Verbraucherschutz NRW |url=http://www.lanuv.nrw.de/wasser/pdf/Gewaesserverzeichnis%20GSK3C.xls |website=lanuv.nrw.de |publisher=Landesamt für Natur, Umwelt und Verbraucherschutz Nordrhein-Westfalen (LANUV) |access-date=28 November 2024 |archive-url=https://web.archive.org/web/20131228062035/http://www.lanuv.nrw.de:80/wasser/pdf/Gewaesserverzeichnis%20GSK3C.xls |archive-date=2013-12-28 |language=de |date=2010}} It flows through the Bilstein Cave and discharges into the Schorenbach near Warstein.