Arumuka Navalar (Tamil: ஆறுமுக நாவலர், āṟumuka nāvalar ^?, December 18, 1822 – December 5, 1879) was one the early revivalists of native Hindu Tamil traditions in Sri Lanka and India. He and others like him were responsible for reviving and reforming native traditions that had come under a long period of dormancy and decline during the previous 400 years of colonial rule by various European powers. A student of the Christian missionary school system who assisted in the translation of the King James Bible into Tamil, he was influential in creating a period of intense religious transformation amongst Tamils in India and Sri Lanka, preventing large-scale conversions to Protestantism.

As part of his religious revivalism, he was one of the early adaptors of modern Tamil prose, introduced Western editing techniques, and built schools (in imitation of Christian mission schools) that taught secular and Hindu religious subjects. He was a defender of Saivism (a sect of Hinduism) against Christian missionary activity and was one of the first natives to use the modern printing press to preserve the Tamil literary tradition. He published many polemical tracts in defense of Saivism, and also sought and published original palm leaf manuscripts. He also attempted to reform Saivism itself – an effort which sometimes led to the decline of popular deities and worship modes and confrontation with traditional authorities of religion. Some post-colonial authors have criticised his contributions as parochial, limited, conservative, and favouring the elite castes.