John Alexander Lachlan Shaw, was an Australian civil engineer, soldier and New South Wales public servant, who served as the NSW Commissioner for Main Roads from 1962 to 1967.

The Department of Main Roads (DMR) was an agency of the New South Wales Government, responsible for planning, constructing and maintaining major road infrastructure. The DMR directly managed highways and major roads and provided funding to local councils for regional and local roads. The agency was merged with other agencies to form the Roads & Traffic Authority in 1989.