William Allan Pyatt, CBE (known as Allan; also spelled Alan or Allen; 4 November 1916 – 24 November 1991), was Bishop of Christchurch in the Anglican Church in Aotearoa, New Zealand and Polynesia from 1966 to 1983. Pyatt retired in November 1983. In the 1985 New Year Honours, he was appointed a Commander of the Order of the British Empire. He died on 24 November 1991.