Agasthyakoodam (Malayalam: അഗസ്ത്യകൂടം) (also known as Agastyarkoodam is a 1,868 metres (6,129 ft) peak within Neyyar Wildlife Sanctuary, Kerala in the Western Ghats of South India. The mountain lies on the border between the Indian states of Kerala and Tamil Nadu (inTirunelveli). The perennial Thamirabarani River originates from the eastern side of this hill and flows into the Tirunelveli District of Tamil Nadu.
Agastyakoodam is a trekking destination and a pilgrim centre for devotees of the Hindu sage Agastya, who is considered to be one of the seven rishis(Saptarishi) of Hindu Puranas. There is a full-sized statue of Agathiyar at the top of the peak and the devotees can offer pujas themselves.