| Badlishah Malay: {{Script|Arab|بدلي شاه | |
| Sultan of Kedah | |
| Succession: | Sultan of Kedah |
| Reign: | 13 May 1943 – 13 July 1958 |
| Predecessor: | Abdul Hamid Halim Shah |
| Successor: | Abdul Halim Mu'adzam Shah |
| Birth Date: | 17 March 1894 |
| Birth Place: | Alor Setar, Kedah, Siam |
| Death Place: | Alor Setar, Kedah, Federation of Malaya |
| Spouse: | Tunku Sofia binti Almarhum Tunku Mahmud (1899-1934, m.1922-1934, her death) Sultanah Asma binti Almarhum Sultan Sulaiman Badrul Alam Shah (1911-1994, m.1934-1958, his death) |
| Issue: |
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| House: | Mahawangsa |
| Father: | Abdul Hamid Halim Shah |
| Mother: | Tunku Nai Sofiah binti Almarhum Tunku Nai Haji Hassan |
| Religion: | Sunni Islam |
| Place Of Burial: | Langgar Royal Mausoleum |
Sultan Sir Badlishah ibni Almarhum Sultan Abdul Hamid Halim Shah (Jawi: Malay: 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 also served as regent of Kedah between 1937 and 1943. In 1943, he was deposed by the Imperial Japanese Army, but was reinstated in 1945 following their surrender and the end of the Japanese occupation of Malaya.
Sultan Badlishah was married twice. His first marriage was to Tunku Sofiah binti Almarhum Tunku Mahmud (born 1899) in 1922. The marriage produced an heir, Sultan Abdul Halim who was the fifth King of Malaysia and the 28th Sultan of Kedah. Tunku Sofiah died in 1934 in an automobile accident.
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.