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Illam (/ˈɪləm/) is a Malayalee lineage system used for classification and identification of castes in Kerala, South India. The system is most notably used by the Thiyyas and Nambudiris.

The Nambudiris, who are the Brahmins of Kerala, also refer to their lineages as the Brahmaalayam or Mana. The line is built according to the canons of Vaasthusaasthram, meaning architecture in the Sanskrit language.

In the Thiyya system, there are eight illam from where they are believed to originate.