Weld River
{{Short description|River in Western Australia}}
{{about|the river in Western Australia|the river of the same name in Tasmania|Weld Valley}}
{{Use dmy dates|date=March 2015}}
{{Use Australian English|date=March 2015}}
{{Infobox river
| name = Weld
| name_native =
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| image =
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| map =
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| pushpin_map = Australia Western Australia
| pushpin_map_size =
| pushpin_map_caption= Location of the mouth in Western Australia
| subdivision_type1 = Country
| subdivision_name1 = Australia
| subdivision_type2 = State
| subdivision_name2 = Western Australia
| subdivision_type3 = Region
| subdivision_name3 = South West
| subdivision_type4 =
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| length = {{convert|37|km|mi|abbr=on}}
| width_min =
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| discharge1_location=
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| source1 = Mount Burnside
| source1_location = Lake Muir State Forest
| source1_coordinates=
| source1_elevation = {{convert|211|m|abbr=on}}
| mouth = Deep River
| mouth_location =
| mouth_coordinates = {{coord|34|49|31|S|116|34|59|E|display=inline,title}}
| mouth_elevation = {{convert|52|m|abbr=on}}
| progression =
| river_system =
| basin_size = {{convert|240|km2|abbr=on}}
| tributaries_left =
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| custom_label = National park
| custom_data = Shannon National Park
| extra = {{cite web|url=http://www.bonzle.com/c/a?a=p&p=207334&cmd=sp&c=1&x=116%2E6267&y=%2D34%2E75288&w=73778|title=Map of Weld River, WA|work=Bonzle Digital Atlas|year=2006|access-date=23 November 2008}}{{cite journal|url=http://engineering.tufts.edu/cee/people/vogel/publications/floodflow-australia.pdf|title=Journal of Hydrology - Floodflow frequency model selection in Australia|year=1992|access-date=23 November 2008}}
}}
The Weld River is a river in the South West region of Western Australia.
The river rises below Mount Burnside in the Lake Muir State forest. The river flows in a southerly direction through the Shannon National Park until it flows into the Deep River, of which it is a tributary.
The water quality of the river is excellent and is considered fresh.{{cite journal|url=https://doi.org/10.1023%2FA%3A1009060912470|title=Hydrological exchange and subsurface water chemistry in streams varying in salinity in south-western Australia |year=2006|access-date=3 November 2008|doi=10.1023/A:1009060912470|volume=8|journal=International Journal of Salt Lake Research|pages=361–382|last1=Boulton |first1=A.J. |last2=Marmonier |first2=P. |last3=Davis |first3=J.A. |issue=4 |url-access=subscription }}