Kelantan (Malay pronunciation: [kəˈlantan]; Jawi: کلنتن; rtgs: Kalantan, Kelantanese: Kelate) is a state of Malaysia. The capital and royal seat is Kota Bharu. The honorific of the state is Darul Naim, (Jawi: دار النعيم, "The Blissful Abode"). Kelantan is positioned in the north-east of Peninsular Malaysia. It is bordered by Narathiwat Province of Thailand to the north, Terengganu to the south-east, Perak to the west, and Pahang to the south. To the north-east of Kelantan is the South China Sea.

Kelantan is located in the north-eastern corner of the peninsula. Kelantan, which is said to translate as the "Land of Lightning" (see alternate theories below), is an agrarian state with green paddy fields, rustic fishing villages and casuarina-lined beaches. Kelantan is home to some of the most ancient archaeological discoveries in Malaysia, including several prehistoric aboriginal settlements.

Due to Kelantan's relative isolation and largely rural lifestyle, Kelantanese culture differs somewhat from Malay culture in the rest of the peninsula; this is reflected in the cuisine, arts, and the unique Kelantanese Malay language, which is unintelligible even for some speakers of standard Malay.

There are a number of suggestions for the origin of the name Kelantan. One theory, according to historian Mohd Rosli Bin Ismail, proposes that Kelantan is a corruption of gelam hutan, i.e. the Malay word for the cajuput, or swamp tea tree (Melaleuca leucadendron). Other theories claim that the name comes from the Malay word kilatan, 'shiny/glittery' or kolam tanah, 'clay pool'. Kelantan was called Kalantan (Thai: กลันตัน) by the Siamese when it was under their influence.

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