Gidea Park railway station is on the Great Eastern Main Line, serving the neighbourhood of Gidea Park in Romford, located in the London Borough of Havering, east London. It is 13 miles 41 chains (21.7 km) down the line from London Liverpool Street and is situated between Romford and Harold Wood. Its three-letter station code is GDP and it is in Travelcard zone 6. The station is managed and served by the Elizabeth line.

The Great Eastern Main Line is a 114.5-mile (184.3 km) major railway line on the British railway system which connects Liverpool Street station in central London with destinations in east London and the East of England, including Shenfield, Chelmsford, Colchester, Ipswich and Norwich. Its numerous branches also connect the main line to Southminster, Braintree, Sudbury, Harwich and a number of coastal towns including Southend-on-Sea, Clacton-on-Sea, Walton-on-the-Naze and Lowestoft.