Bogar or Bhogar or Boganathar has been described in varying traditions as either a South Indiansiddhar or a Chinese philosopher (Buddhist philosopher) who lived sometime between the 3rd and the 5th century CE. Those who consider him to have been a Chinese Taoist philosopher say that he went to South India to learn medicine. Bogar is considered as a contemporary of Thirumoolar. Samadhi for Bogar is reported in at least six places in Tamil Nadu.
It is said that Bogar created the image of Murugan at the hill temple in Palani from an alloy made from nine alloys He also established the temple for Lord Muruga in Katharagama, Sri Lanka. There is no statue of Muruga but only a copper plate with manthras wriiten The priests of Palani Murugan temple were said to have been the descendants of Pulipanni, one of Bogar's students, until the sixteenth century.
According to siddha medicine documents, Bogar was the discoverer of an elixir of immortality. The Pharmacognosy is the best of his treatises. His other works are on yoga, archery and a glossary on medicine.