The Tweed River is a minor river located in the Marlborough district on the South Island of New Zealand.

Tweed River
Location of the Tweed River
Physical characteristics
Source	Robinson Saddle
• location	Inland Kaikōura Range
Mouth
• location	Confluence with the Waiau Toa / Clarence River
• coordinates	42°15′S 173°18′E
Basin features
River system	Waiau Toa / Clarence River

It drains Lake McRae, Carters and Robinson Saddles on the south-western side of the Inland Kaikōura Range and feeds into the Waiau Toa / Clarence River. The Tweed River lies within the borders of Molesworth Station.