Prime minister Bahrain's prime minister, Sheikh Khalifah bin Sulman Al Khalifah has been in the post since 1970, making him the longest serving non-elected prime minister. The post of prime minister may be encountered both in constitutional monarchies (such as Belgium, Denmark, Japan, Luxembourg, the Netherlands, Norway, Malaysia, Morocco, Spain, Sweden, Thailand, Canada, Australia, New Zealand, and the United Kingdom), and in parliamentary republics in which the head of state is an elected official (such as Finland, the Czech Republic, France, Greece, Hungary, India, Indonesia (1945-1959), Ireland, Pakistan, Portugal, Montenegro, Croatia, Bulgaria, Romania, Serbia and Turkey (1923-2018)). See also "First Minister", "Premier",
Prime Minister of Australia use it when he was no longer PM. Only one Prime Minister who had left the Federal Parliament ever returned. Stanley Bruce was defeated in his own seat in 1929 while Prime Minister but was re-elected to parliament in 1931. Other Prime Ministers were elected to parliaments other than the Australian federal parliament: Sir George Reid was elected to the UK House of Commons (after his term as High Commissioner to the UK), and Frank Forde was re-elected to the Queensland Parliament (after his term as High Commissioner to Canada, and a failed attempt to re-enter the Federal Parliament). From