The river's name derives from Welsh and means the river on which ash trees (Welsh: onnau) grew.
The river has its sources in the Shropshire Hills at White Grit, located in Mid and South-west Shropshire. It has two branches, the East Onny and West Onny, which converge at Eaton, to the east of Lydham. The River Onny then flows in a south-easterly direction, through Craven Arms and Onibury (a village it gives its name to), before it finally has its confluence with the River Teme just upstream of Ludlow at Bromfield. From White Grit to Bromfield, the river flows over a distance of 25 miles (40 km).
- Ekwall 1974, p. 350.
- "Shropshire Watercourses". www.shropshirehistory.com. Retrieved 4 March 2017.
- "Onny - conf R E Onny to conf R Teme". environment.data.gov.uk. Environment Agency. Retrieved 4 March 2017.
- "Onny - source to conf R E Onny". environment.data.gov.uk. Environment Agency. Retrieved 4 March 2017.
- "Onny River Section" (PDF). esdm.co.uk. Retrieved 4 March 2017.
- Collins Britain Big Road Atlas 2009 (Map). 1:200,000. Collins Bartholomew. 2008. pp. 78–79. ISBN 978-0-00-727240-2.
- Ekwall, Eilert (1974). The concise Oxford dictionary of English place-names (4 ed.). Oxford, UK: Clarendon Press. ISBN 0-19-869103-3.CS1 maint: ref=harv (link)
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