William Lloyd Lange (27 June 1937 – 24 November 2013) was an Australian politician.
He was a Liberal member of the New South Wales Legislative Council from 1974 to 1986, serving as Leader of the Opposition in the Legislative Council from 1981 to 1984, and as Opposition Spokesman for Minerals and Energy and Deputy Leader of the Liberal Party from 1984 to 1986.
On 22 November 1963 he married Pamela Marion Daley, with whom he had five children.
He was appointed Chairman of the New South Wales Coal Compensation Board and Deputy Chairman of the New South Wales Government Insurance Office in 1988.
He left the Insurance Office in 1992 to become Director of Abigail Group Ltd.