The Andi Koysu (Russian: Андийское Койсу - Andiyskoye Koysu, Georgian: ანდის ყოისუ - Andis Qoisu) is a river in Dagestan (Russia) and Georgia.

It is 144 kilometres (89 mi) long or 192 kilometres (119 mi) including its longest source river, Tushetis Alazani, and its drainage basin covers 4,810 square kilometres (1,860 sq mi).

[1] At its confluence with the Avar Koysu, near the village Gimry in central Dagestan, it forms the river Sulak.

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