Kedah (Malay pronunciation: [kəˈdɑh]; Jawi: قدح), also known by its honorific, Darul Aman or "Abode of Peace", is a state of Malaysia, located in the northwestern part of Peninsular Malaysia. The state covers a total area of over 9,000 km², and it consists of the mainland and Langkawi. The mainland has a relatively flat terrain, which is used to grow rice. Langkawi is an archipelago of islands, most of which are uninhabited. Kedah was called Kadaram (Tamil: காடாரம்; kādaram) by ancient and medieval Tamil people and Syburi (Thai: ไทรบุรี; rtgs: Sai Buri) by the Siamese when it was under their influence.

To the north, Kedah borders the state of Perlis and shares an international boundary with the Songkhla and Yala provinces of Thailand. It borders the states of Perak to the south and Penang to the southwest.

The state's capital is Alor Setar and the royal seat is in Anak Bukit. Other major towns include Sungai Petani, and Kulim on the mainland, and Kuah on Langkawi.

Archaeological evidence found in Bujang Valley reveals that a Hindu–Buddhist kingdom ruled ancient Kedah possibly as early as 110 A.D. The discovery of temples, jetty remains, iron smelting sites, and clay brick monuments dating back to 110 A.D shows that a maritime trading route with south Indian Tamil kingdoms was already established since that time. The discoveries in Bujang Valley also made the ancient Kedah as the oldest civilisation of Southeast Asia.

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