This is a list of rivers and natural waterways that flow either wholly or partially through the ceremonial county of Wiltshire. The list is not comprehensive as there are many small brooks and streams without a recorded name on most official maps. There are three notable rivers that flow through the county: the River Avon (Bristol), the River Avon (Hampshire) and the River Thames.
Due to the geology of the county, the rivers and waterways discharge to the west, east and south. In addition to the natural waterways, the Kennet and Avon Canal crosses the county.
| width=9% | Name | width=14% | Source | width=14% | Mouth | width=12% | Image |
|---|
| Bristol Avon | Acton Turville
51.5303°N -2.2739°W | Severn Estuary, Avonmouth, Bristol
51.5061°N 2.7183°W | |
| Hampshire Avon | Pewsey, Wiltshire
51.3694°N -1.695°W | English Channel, Mudeford, Dorset
50.7231°N -1.7481°W | |
| near Upton Scudamore, Wiltshire
51.2283°N -2.1944°W | River Avon at Staverton, Wiltshire
51.3367°N -2.2156°W | |
| Blackwater | Redlynch, Wiltshire
50.9897°N -1.7122°W | Totton, Hampshire
50.9267°N -1.4919°W | |
| Bourne | Burbage
51.3525°N -1.6714°W | Salisbury
51.0622°N -1.7894°W | |
| Broadmead Brook | west of Marshfield, Gloucestershire
51.4567°N -2.3625°W | Bybrook River north west of Castle Combe
51.4983°N -2.2369°W | |
| Brinkworth Brook | Broad Hinton, Wiltshire
51.5022°N -1.8735°W | Bristol Avon, Great Somerford, Wiltshire
51.5454°N -2.0382°W | |
| Bybrook River | Prime: Lower Lapdown Farm, Tormarton, South Gloucestershire
51.4983°N -2.3429°W
Secondary: Folly Farm, Cold Ashton, South Gloucestershire
51.4565°N -2.3621°W | Bristol Avon, Batheaston
51.4016°N -2.3102°W | |
| Bydemill Brook | Stanton Country Park, south of Stanton Fitzwarren
| confluence with River Thames
51.6698°N -1.7193°W | |
| Chalke | Mead End, near Bowerchalke, Wiltshire
51.0122°N -1.9656°W | confluence with River Ebble at Broad Chalke
51.0264°N -1.9575°W | |
| River Churn | Seven Springs, Gloucestershire
51.8511°N -2.0503°W | confluence with River Thames
51.6539°N -1.8533°W | |
| Cocklemore Brook | Studley, Wiltshire
51.4172°N -2.0683°W | River Avon (Bristol) south of Chippenham
51.4322°N -2.1019°W | |
| Cole | Wanborough, Wiltshire
51.5428°N -1.6983°W | River Thames
51.6886°N -1.0769°W | |
| Damson Brook | Milston
51.2061°N -1.7689°W | confluence with Nine Mile River
51.1889°N -1.76°W | No picture available |
| Derry Brook | Ravensroost Wood, Minety Common
| confluence with Swill Brook south of Ashton Keynes
| No picture available |
| Doncombe Brook | south of Marshfield, Gloucestershire
| confluence with Bybrook River at Ford
| |
| Great Bedwyn
51.3711°N -1.6069°W | River Kennet near Hungerford
51.4122°N -1.4942°W | |
| River Dun (River Test) | 51.0533°N -1.6827°W | Confluence with River Test near Kimbridge in Hampshire
| |
| River Ebble | Alvediston
| confluence with River Avon
| |
| Gauze Brook | Littleton Drew
| River Avon (Bristol) south of Malmesbury
| |
| River Kennet | Swallowhead Spring near Silbury Hill
| confluence with River Thames at Reading
| |
| Key | Braydon Forest near Purton
51.5864°N -1.8658°W | confluence with River Thames near Cricklade
51.6394°N -1.8575°W | |
| Lambrok Stream | Hoopers Pool between Southwick and Rode
| confluence with River Biss at Trowbridge
| |
| River Marden | Ranscombe Bottom, Calstone Wellington, near Calne
51.4156°N -2.0133°W | Bristol Avon near Chippenham
51.4656°N -2.0925°W | |
| River Nadder | Springs at Nadder Head near Donhead St Mary
| Confluence with River Avon (Hampshire) in Salisbury
| |
| Brigmerston Down northeast of Bulford Camp
| Confluence of River Avon at Bulford
| |
| Oddford Brook | Bitham Lake northwest of Tisbury
| confluence with River Nadder at Tisbury
| No picture available |
| Draycot Foliat
51.4981°N -1.7403°W | River Kennet near Marlborough
51.4203°N -1.7286°W | |
| Wroughton
51.5233°N -1.7914°W | Confluence with River Thames51.6442°N -1.8222°W | |
| River Sem | near Sedgehill
| near Wardour
| No picture available |
| Semington Brook | The Warren south of West Lavington
| confluence with River Avon (Bristol) near Whaddon
| |
| River Stour, Dorset | Stourhead
| English Channel at Christchurch, Dorset
| |
| Summerham Brook | north of Rowde
| confluence with Semington Brook, south of Seend Cleeve
| |
| Swill Brook | confluence of Braydon Brook and Flagham Brook near Somerford Keynes
| confluence with River Thames at Ashton Keynes
| |
| Tetbury Avon | Wor Well, Tetbury
| River Avon (Bristol) at Malmesbury
| |
| Thames | | leaves Wiltshire to the southwest of Lechlade-on-Thames | |
| Till | near Tilshead
51.2303°N -1.9558°W | confluence with River Wylye near Stapleford
51.1358°N -1.9019°W | |
| Midgehall Copse near Lydiard Millicent
| | No picture available |
| Rodmead Farm near Maiden Bradley
51.1236°N -2.3031°W | Confluence with River Nadder
51.0792°N -1.8625°W | |
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