The Maplin Sands are mudflats on the northern bank of the Thames estuary, off Foulness Island, near Southend-on-Sea in Essex, England, though they actually lie within the neighbouring borough of Rochford. They form a part of the Essex Estuaries Special Area of Conservation due to their value for nature conservation, with a large colony of dwarf eelgrass (Zostera noltei) and associated animal communities.
A screw-pile lighthouse was built on the sands in 1838  by Messrs. Mitchel and Sons by the recommendation of James Walker of Trinity House. It was the first screwpile lighthouses ever to be designed. Although construction of the Maplin Sands Light had started before, the Wyre Light (Fleetwood) was completed in a much shorter period of time.
In the later part of the 19th century John I. Thornycroft & Company and Yarrow Shipbuilders used the sands for the measured mile speed trials of their destroyers. The shallow waters resulted in a flow of water that could add up to a knot to the ship's speed. When the Admiralty found out they required that all future trials be carried out in deep water.
Following the report of the 1968 Roskill Commission, in 1973 plans were proposed and approved for a third airport for London, the Thames Estuary Airport, but were abandoned in 1974 in the wake of the 1973 oil crisis. The project would also have included a deep-water harbour suitable for the container ships then coming into use, a high-speed rail link to London, and a new town for the accommodation of the thousands of workers who would be required.
- "Essex Estuaries Site details". JNCC. Retrieved 15 December 2016.
- Macfarlane, Robert (11 January 2017). "This desolate English path has killed more than 100 people". BBC. Retrieved 12 January 2017.
- "Messrs. Mitchell and Sons Screw-pile Battery, and Light-House", Belfast News Letter, p. 1, Jan 30, 1844,
That the first of such foundations was fixed on the Maplin Sands by these engineers (Messrs. Mitchel and Son), in the summer of 1838 by order of the corporation of Trinity House, at the recommendation of their engineer, James Walker, Esq. F.R.S., &c. Who has since erected on it the Maplin lighthouse
- Tomlinson, ed. (1852–54). Tomlinson's Cyclopaedia of Useful Arts. London: Virtue & Co. p. 177.
- Eugenio Ribera, José (1895). Puentes de hierro económicos, muelles y faros sobre palizadas y pilotes mecánicos. Madrid: Librería Editorial de Bailly-Bailliere e Hijos. pp. 299 (Lámina XIII).
- Preston, Antony (2002). The World's Worst Warships. Conway Maritime Press. p. 14. ISBN 0-85177-754-6.
- Needham, Duncan (27 October 2014). "Maplin: the Treasury and London's third airport in the 1970s". History & Policy. History & Policy. Retrieved 27 July 2016.
- for Maplin Sands
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