The East Lyn is a river which rises high in Exmoor, in the English county of Somerset.

When the pressure behind the dam increased to uncontrollable levels, the water broke out of the dam, and rushed down the East Lyn (via the convergence of the rivers) into Lynmouth, obliterating houses and ultimately resulting in 34 deaths.

Boulders from the incident can still be seen today along the banks of the East Lyn towards Lynmouth.

Angling interests especially in the summer are targeted towards the salmon which migrate up the river to spawn.

Whitewater kayakers frequently run this river in the winter when seeking a challenging Grade 4 paddle.