Sir William Alan Nield, GCMG, KCB was an English civil servant. Nield studied at Stockport Grammar School and St Edmund Hall, Oxford. He served with the Royal Air Force and Royal Canadian Air Force in the Second World War before he joined the Civil Service in 1946. After five years as an under-secretary at the Ministry for Agriculture, Food and Fisheries, in 1964 he was appointed under-secretary and then, from 1965, deputy secretary at the Department of Economic Affairs (DEA). He spent two years as a deputy secretary at the Cabinet Office (1966–68) before returning to the DEA as Permanent Secretary in 1968; it was a short-lived appointment for the department was abolished the following year. Nield was nonetheless appointed a KCB in 1968.