Sultan Sir Badlishah ibni Almarhum Sultan Abdul Hamid Halim Shah KCMG KBE (17 March 1894 – 13 July 1958) was the 27th Sultan of Kedah, a present Malaysian state, between 1943 and 1958. He succeeded the throne upon the death of his father, Sultan Abdul Hamid Halim Shah. He was the elder half brother of the first Prime Minister of Malaysia, Tunku Abdul Rahman.