Farlington Marshes is a 119.7-hectare (296-acre) Local Nature Reserve near Portsmouth in Hampshire.

It is owned by Portsmouth City Council and managed by Hampshire and Isle of Wight Wildlife Trust.

[6] It is also part of Solent Maritime Special Area of Conservation[7] and of Chichester and Langstone Harbours Ramsar site[8] and Special Protection Area.

[11] It is a feeding ground for overwintering Brent geese.

[11] During World War 2 it was used as a starfish site acting as a decoy for Portsea Island.