Biggar Water is a river in Lanarkshire and Peeblesshire, in the Southern Uplands of Scotland.

Biggar Water
Confluence of the Biggar Water and Tweed
Location
Country	Scotland, United Kingdom
Council area	South Lanarkshire
OS grid reference	NT045375
Physical characteristics
Mouth	Confluence with the River Tweed
• coordinates	55°36′11″N 3°22′38″W / 55.603074°N 3.377176°W / 55.603074; -3.377176

It forms part of the River Tweed system. It rises, as Biggar Burn, in the north-east of the parish of Biggar, South Lanarkshire and flows about 6+3⁄4 miles (10.9 km) generally south-westerly toward the town of Biggar, where it becomes Biggar Water. It then flows about 5 miles (8.0 km) eastwards before its confluence with the Tweed 3⁄4 mile (1.2 km) mile north-east of Drumelzier in Peeblesshire.^[1]