Lansdowne River, a watercourse of the Manning River catchment, is located in the Mid North Coast district of New South Wales, Australia.

Lansdowne River rises below Mount Gibraltar in the Gibraltar Range, north northwest of Upper Lansdowne, and flows generally southeast before reaching its confluence with the Northern Arm of the Manning River, near Coopernook. The river descends 740 metres (2,430 ft) over its 51 kilometres (32 mi) course.

The Pacific Highway crosses the Lansdowne River south-east of Coopernook.

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

• "Manning River catchments" (map). Office of Environment and Heritage. Government of New South Wales.

31°52′S 152°37′E / 31.867°S 152.617°E / -31.867; 152.617