Crosby Beach is part of the Merseyside coastline north of Liverpool in the Metropolitan Borough of Sefton, England.
The beach stretches about 3 miles North-West from the Seaforth Dock in the Port of Liverpool, through Waterloo, where it separates the sea from the Marina, past Crosby Swimming Baths, up beyond the coastguard station in Blundellsands to the estuary of the River Alt.
The navigable shipping channel in Liverpool Bay, connecting the River Mersey to the Irish Sea, runs parallel to the beach to around the coastguard station where it swings out to sea.
The beach has only really been stabilised in the last half a century or so. Prior to this at high tides the sea could come in as far as the first row of houses.Dune management, which is still ongoing to the present day (including the planting of old Christmas trees) and the building of a sea wall have now reduced the problems.
In the older dunes north of the coastguard station, between the sea and the West Lancashire Golf Club, there are still some remains of the old wartime defences.
The Another Place sculptures by Antony Gormley are found here and, after a Sefton Council meeting on 7 March 2007, it has been allowed to stay permanently.
Other redevelopment is planned. The Seaforth radar tower, which stands at the south end of the beach, will be given to the public and a new building, The Mersey Observatory, will be built on the site. As demolition of the old structure is not planned until after 2008, a light display will be installed on the site as part of the Capital of Culture and Mersey Waterfront’s River of Light event. A million pound scheme was proposed to redevelop the nearby Marina as part of a visitor's centre for the beach and Another Place. The new centre was opening in late 2009 under the name of the Crosby Lakeside Adventure Centre, and is also home to the Crosby Scout and Guide Marina Club.