Bogar or Bhogar or Boganathar was a legendary South Indian siddhar (herbal healer) or alchemist. He was said to have been born into a goldsmithing family, and to have had miraculous powers. He is also associated with Mahavatar Babaji in some New Age circles. He was considered to be the foremost disciple of Kalanginathar, a siddha who was a disciple to Thirumoolar.
It is believed that Kalanginathar was the backbone to Bogar's success in his spiritual journey. They both were considered as an epitome for a master disciple relationship. On his master's order he traveled extensively in China to spread his philosophy.
He is said to have travelled widely and to have lived for centuries. Bhogar’s samadhi is found in the South West corridor at the Palani Murugan temple.