Calshot Marshes is a 51.1-hectare (126-acre) Local Nature Reserve near Calshot, at the junction of The Solent and Southampton Water in Hampshire.

It is owned by Hampshire County Council and managed by Hampshire Countryside Service.

[1][2] It is part of Solent and Southampton Water Ramsar site[3] and Special Protection Area,[4] of Solent Maritime Special Area of Conservation[5] and of Hythe to Calshot Marshes Site of Special Scientific Interest.

[6] This saltmarsh site is internationally important for dark-bellied brent geese and nationally important for wigeon, teal, ringed plover, grey plover, black-tailed godwit, redshank and dunlin.

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