Theobalds Brook is a minor tributary of the River Lea which rises in the hills south of Goffs Oak in Hertfordshire, England.
Counties: Bedfordshire · Essex · Hertfordshire · Greater London · Mouth: River Thames Settlements: Luton · Harpenden · Wheathampstead · Welwyn Garden City · Hertford · Ware · Stanstead Abbotts · Hoddesdon · Broxbourne · Cheshunt Waltham Abbey · Ponders End · Edmonton · Tottenham · Upper Clapton · Hackney Wick · Stratford · Bromley-by-Bow · Canning Town · Leamouth
Major tributaries: River Ash · River Beane · River Ching · River Mimram · River Moselle · River Rib · River Stort
Minor tributaries: Bayford Brook · Broxbourne Mill Stream · Cobbins Brook · Coppermill Stream · Cornmill Stream • Cuffley Brook · Dagenham Brook · Hackney Brook · Millhead Stream • Pymmes Brook · Rags Brook • River Lynch · Salmons Brook Small River Lea & Turnford Brook · Spital Brook · Theobalds Brook · Turkey Brook · Woollens Brook · Wormleybury Brook