Chattampi Swamikal
| Vidyadhiraja  Parama Bhattaraka Chattampi Swamikal | |
|---|---|
| Commemorative stamp released on 30 April 2014, by the Government of India on Swamikal's 90th death anniversary | |
| Personal life | |
| Born | 25 August 1853 | 
| Died | 5 May 1924 (aged 70) | 
| Resting place | Panmana Asramam | 
| Honors | Sree Vidyadhiraja Parama Bhattaraka Shanmughadasan | 
| Religious life | |
| Religion | Hinduism | 
| Philosophy | Advaita | 
| Religious career | |
| Guru | 
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| Other names | Ayyappan Pillai, Kunjan Pillai, Shanmukhadasan | 
Ayyappan Pillai (born 25 August 1853 – 5 May 1924), better known as Chattampi Swamikal was a Hindu sage and social reformer whose thoughts and work influenced the launching of many social, religious, literary and political organisations and movements in Kerala and gave voice to those who were marginalised.
Chattampi Swamikal denounced the orthodox interpretation of Hindu texts citing sources from the Vedas. Swamikal strove to reform the heavily ritualistic and caste-ridden Hindu society of the late 19th century Kerala. Swamikal also worked for the emancipation of women and encouraged them to come to the forefront of society. Swamikal promoted vegetarianism and professed non-violence (Ahimsa). Swamikal believed that the different religions are different paths leading to the same place. Chattambi Swamikal led a wandering life like an avadutha and throughout his intellectually and spiritually enriched life maintained many friends from different regions of Kerala. He authored several books on spirituality, history, and language staying with these friends.