David Hadley Lange (born 1947) is a former Canadian provincial politician.
He was the first and only representative of Assiniboia-Bengough, as it was replaced before the next election by the ridings of Bengough-Milestone and Assiniboia-Gravelbourg.
Following the dissolution of the Assiniboia-Bengough riding, he was elected as representative for the newly created constituency of Bengough-Milestone.
He did not run in the 1978 election and was replaced as representative of Bengough-Milestone by Progressive Conservative Robert Hugh Pickering.
This article about a Saskatchewan politician is a stub.