Marshalswick is a suburb of St Albans in Hertfordshire, England, located around 1.5 miles northeast of the city centre. The area was developed from the 1920s onwards. Neighbouring suburbs include Jersey Farm, Fleetville and Bernards Heath. The 1950s parish church of St Mary's was built as a daughter church of St Leonard's Church, Sandridge and later became an ecclesiastical parish in its own right in 1972.