Malayness (Kemelayuan, Jawi: ) is the state of being Malay or of embodying Malay characteristics. This may include that which binds and distinguishes the Malay people and forms the basis of their unity and identity. People who call themselves Malay are found in many countries in Southeast Asia, united by a notional shared identity but divided by political boundaries, divergent histories, variant dialects and peculiarities of local experience. While the term 'Malay' is widely used and readily understood in the region, it remains open to varying interpretations due to its varied and fluid characteristics. 'Malay' as an identity, or nationality, is considered one of the most challenging and perplexing concepts in the multi-ethnic world of Southeast Asia.
Much of the ethos of Malay identity are thought to originate from the ascendancy of Melaka Sultanate in the 15th century. After the fall of Melaka in 1511, the notion of Malayness developed in two ways: to claim lines of kingship or acknowledge descent from Srivijaya and Melaka, and to refer to a pluralistic commercial diaspora around the peripheries of the Malay world that retained the Malay language, customs and trade practices of the Melaka emporium. By the mid 20th century, an anti-Western colonialism concept of a romanticized Malayness has been an integral component of Malay nationalism, succeeded in ending the British rule in Malaya.
Today, the most commonly accepted pillars of Malayness; the Malay rulers, Malay language and culture, and Islam, are institutionalized in both Malay majority countries, Brunei and Malaysia. As a still fully functioning Malay sultanate, Brunei proclaimed Malay Islamic Monarchy as its national philosophy. In Malaysia, where the sovereignty of individual subnational Malay sultanates and the position of Islam are preserved, a Malay identity is defined in Article 160 of the Constitution of Malaysia.
The Malay World, the home of the Malayic Austronesian tribes since the last ice age (circa 15,000–10,000 BCE), exhibits fascinating ethnic, linguistic and cultural variations as a result of having inherited different layers of foreign influences.