Illathu Nair

Nair soldiers with European army - A wall-painting at Krishnapuram Palace
Regions with significant populations
Kerala
Languages
Malayalam
Religion
Hinduism

The Nair /ˈnɑː.jər/, also known as Nayar, are a group of Indian castes, described by anthropologist Kathleen Gough as "not a unitary group but a named category of castes". The Nair include several castes and many subdivisions, not all of whom historically bore the name 'Nair'. These people lived, and continue to live, in the area which is now the Indian state of Kerala. Their internal caste behaviours and systems are markedly different between the people in the northern and southern sections of the area, although there is not very much reliable information on those inhabiting the north.

Historically, Nairs lived in large family units called tharavads that housed descendants of one common female ancestor. These family units along with their unusual marriage customs, which are no longer practiced, have been much studied. Although the detail varied from one region to the next, the main points of interest to researchers of Nair marriage customs were the existence of two particular rituals — the pre-pubertal thalikettu kalyanam and the later sambandam - and the practice of polygamy in some areas. Some Nair women also practiced hypergamy with Nambudiri Brahmins from the Malabar region.

The Nair were historically involved in military conflicts in the region. Following hostilities between the Nair and the British in 1809, the British limited Nair participation in the British Indian Army. After India's independence, the Nair Brigade of the Travancore State Force was merged into the Indian Army and became a part of the 9th Battalion, Madras Regiment, the oldest battalion in the Indian Army.