Sultan Sir Badlishah ibni Almarhum Sultan Abdul Hamid Halim Shah KCMG KBE (Jawi: سلطان سر بدلي شاه ابن المرحوم سلطان عبد الحميد حليم شاه; 17 March 1894 – 13 July 1958) was the 27th Sultan of Kedah and reigned from 1943 and 1958.
He ascended to the throne upon the death of his father, Sultan Abdul Hamid Halim.
He was the elder half brother of the first Prime Minister of Malaysia, Tunku Abdul Rahman.
Sultan Badlishah's second marriage in 1934 was to Tengku Asma binti Almarhum Sultan Badrul Alam Shah (1911-1994), a Terengganu princess of the Bendahara dynasty.
She served as Sultanah of Kedah and gave birth to a number of children: Sultan Badlishah died on 13 July 1958 and was succeeded by his son, Sultan Abdul Halim.