Chadwell St. Mary is a suburban parish in Thurrock, England, historically part of Essex. The name refers to an old "cold well" and the settlement is still centred on its parish church, which has medieval roots though the area was reshaped by Victorian and 20th‑century growth.
Geographically it sits close to the marshes and industrial frontage of the River Thames, with the nearby Port of Tilbury and logistics and chemical industries giving the area a mixed residential and industrial character. Good road links to London and neighbouring Grays make it a commuter-friendly place, while local shops, schools and sports clubs reflect a community shaped by both riverside history and modern industry.
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