This is a list of tributaries of the River Tees from its source at Teeshead to its mouth at Middlesbrough.
Teeshead Source to Cow Green Reservoir
- Slate Sike
- Swath Beck
- Crooked Beck
- Rake Sike
- Fallcrag Sike
- Trout Beck
- Tynegreen Sike
- Great Dodgen Pot Sike
- Crook Burn
- Smithy Sike
- Little Dodgen Pot Sike
- Green Hurth Sike
- Force Burn
Cow Green Reservoir
The following waterways empty into the reservoir.
- Borderonmere Sike
- Dubby Sike
- Dubbysike East Grain
- Near Hole Sike
- Weelhead Sike
- Cowgreen Sike
- Stapestone Sike
- Red Sike
- Whitespot Sike
- Deadcrook Sike
- Cockle Sike
- Rowantree Sike
- Mattergill Sike
Cow Green Reservoir to Middleton-in-Teesdale
- Maize Beck
- Tinkler's Sike
- Birkdale Hush
- Merrygill Beck
- Crookus Gill
- Black Sike
- Fox Earth's Gill
- Fold Sike
- Holmwath Sike
- Wildscar Sike
- South Loom Sike
- Harwood Beck
- Little Sike
- Dufton Sike
- Fell Dike Sike
- Skyer Beck
- Blea Beck
- Smithy Sike
- Hag Sike
- Ettersgill Beck
- How Gill
- Stony Beck
- Bow Lee Beck
- Newbiggin Beck
- Mill Beck
- Unthank Beck
- Brockersgill Sike
- Owl Gill
- Stonygill Sike
- Park End Beck
- Crossthwaite Beck
- Hudeshope Beck
Middleton-in-Teesdale to Barnard Castle
- River Lune
- Intake Sike
- Low Beck Springs
- Eggleston Burn
- Beer Beck
- Raygill Beck
- Wilden Beck
- River Balder
- Lance Beck
- Grise Beck
- Scur Beck
- Deepdale Beck
- Gill Beck
Barnard Castle to Darlington
- Thorsgill Beck
- River Greta
- Whorlton Beck
- Peg Beck
- Alwent Beck
- Black Beck
- Piercebridge Beck
- Ulnaby Beck
- Baydale Beck
Darlington to Middlesbrough
- Claw Beck
- River Skerne
- Spa Beck
- Dalton Beck
- Kent Beck
- Wood Head Gill
- Soursike Gill
- Staindale Beck
- Fardean Side
- Worsall Far Gill
- Worsall Gill
- Hole Beck
- Nelly Burden's Beck
- River Leven
- Bassleton Beck
- Old River Tees
- Lustrum Beck
- Billingham Beck
- Ormesby Beck
- Normanby Beck
- Greatham Creek