Casumer Bach
{{short description|River in Germany}}
{{Expand German|topic=geo|date=October 2011|Casumer Bach}}
{{Infobox river
| name = Casumer Bach
| image =
| image_size =
| image_alt =
| map_size =
| map_alt =
| map_caption =
| mouth_location = Hessel
| mouth_coordinates = {{coord|52.0495|N|8.2459|E|region:DE|display=it}}
| progression = {{RHessel}}
| subdivision_type1 = Country
| subdivision_name1 = Germany
| subdivision_type2 = State
| subdivision_name2 = North Rhine-Westphalia
| length = {{convert|7.2|km|abbr=on}}
| mouth_elevation =
| river_system =
| pushpin_map = North Rhine-Westphalia
| pushpin_map_size = 300
| pushpin_map_caption= North Rhine-Westphalia
| pushpin_map_alt = Relief Map of North Rhine-Westphalia
}}
Casumer Bach is a river of North Rhine-Westphalia, Germany. It is approximately 7.2 km long and flows directly into the Hessel{{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}} east of Versmold.