River Lett
Location
Country	Australia
State	New South Wales
Region	Sydney Basin (IBRA), Central Tablelands
Municipality	City of Lithgow
Physical characteristics
Source	Bell Range
• location	near Bell
Mouth	confluence with the Coxs River
• location	at Glenroy, south-west of Hartley
Length	10 km (6.2 mi)
Basin features
River system	Hawkesbury-Nepean catchment
Tributaries
• left	Dargans Creek
• right	Kangaroo Corner Creek

The River Lett is a perennial stream of the Hawkesbury-Nepean catchment. It is located in the Central Tablelands region of New South Wales, Australia.

The River Lett rises on the southern slopes of the Bell Range, below Bell, approximately 10 kilometres (6.2 mi) north of Mount Victoria, and flows generally west south-west, joined by two minor tributaries, before reaching its confluence with the Coxs River, at Glenroy, south-west of the historical settlement of Hartley. The river course is approximately 10 kilometres (6.2 mi).^[1]

The Great Western Highway traverses the River Lett near Hartley, at the bottom of the ascent of River Lett Hill.^[2] The remains of an old timber bridge that carried traffic on the Great Western Highway over the River Lett can be found near the settlement of Hartley.^[3]

• List of rivers of Australia
• List of rivers of New South Wales (L–Z)
• Rivers of New South Wales

33°32′S 150°12′E / 33.533°S 150.200°E / -33.533; 150.200