David Dick Petrie (10 December 1946 – 31 August 2011) was a Scottish Conservative & Unionist politician. He was a member of the Scottish Parliament for the Highlands and Islands region.He was elected after Mary Scanlon stood down from Holyrood in 2006 to contest the Moray by-election triggered by the death of Margaret Ewing. Petrie followed Scanlon on the Conservative Party list for the Highlands and Islands. He had previously stood as a candidate for Argyll and Bute.