Donald Hope Laidlaw AO LL.B., B.Litt.(Oxon) (6 August 1923 – 14 April 2009) was a lawyer, businessman and politician in the State of South Australia. He was born to Mr. and Mrs. Lyndley Hope Laidlaw of Victoria Avenue, Unley Park, and educated at St. Peter's College, then studied Law and Literature at Adelaide University and Magdalen College, Oxford. He was called to the Bar in 1948. During World War II he served in the AIF. Intelligence Corps as a Japanese interpreter. Laidlaw was elected as a Liberal candidate to the Legislative Council in July 1975 and served until November 1982.