Gairdner River is a river located in the Great Southern region of Western Australia. The river was first recorded by Surveyor General John Septimus Roe in 1848, when carrying out exploration of the area, noting that natives referred to it and its numerous branches as "Jeer-A-Mung-Up". Roe named the river after Gordon Gairdner, Senior Clerk of the Australian and Eastern Departments in the Colonial Office, later Chief Clerk of the Colonial Office and Secretary and Registrar of the Most Distinguished Order of Saint Michael and Saint George.