Air Vice-Marshal William Edward Theak, CB, CBE (1898 – 28 January 1955) was a First World War pilot in the Royal Flying Corps and a senior officer in the Royal Air Force during the Second World War and the post war decade.

William Theak
Born1898
Clapton, London, England
Died28 January 1955
Suffolk, England
AllegianceUnited Kingdom
Service / branchBritish Army (1917–18)
Royal Air Force (1918–54)
Years of service1917–1954
RankAir vice-marshal
Service number765252
CommandsNo. 90 (Signals) Group (1951–54)
No. 60 (Signals) Group (1944–45)
No. 7 Squadron (1938–39)
Battles / warsFirst World War
Second World War
AwardsCompanion of the Order of the Bath
Commander of the Order of the British Empire
Mentioned in dispatches (2)

In 1940, Theak was appointed as the chief signals officer at the headquarters of Bomber Command. In February 1944, he was promoted to air vice-marshal and given command of No. 60 (Signals) Group.

After the war Theak was made the director-general of signals at the Air Ministry. In 1949 he took up post as the air officer administration at the headquarters of the Middle East Air Force. In 1951 he returned to Great Britain to serve as Air Officer Commanding No. 90 (Signals) Group. He retired in March 1954 and died the following year.

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Military offices
Preceded by Director-General of Signals
1945–1949
Succeeded by
Preceded by Air Officer Commanding No. 90 (Signals) Group
1951–1954
Succeeded by