Perumal Rasu (born 19 November 1931) is an Indian poet and a writer from Krishnagiri, Krishnagiri District, Tamil Nadu.

Perumal Rasu is also a painter, martial artist, and Spiritual master.

His followers consider him a great soul (Sanskrit: Mahatma) and address him as Karumalai Siddhar (English: Saint of Krishnagiri).

He is a devotee of Yogi Ramsuratkumar, popularly known as "Visiri samiyar" His Maathiyosi (Tamil: மாத்தியோசி) was serialized in a popular regional weekly, Ananda Vikatan and won accolades.

Owing to its huge popularity, the series was released as a book.