Va. Jagannathan (11 April 1906 – 4 November 1988), popularly known by his initials as Ki.

[2] He was a student of noted Tamil scholar and publisher U. V. Swaminatha Iyer.

He won the Sahitya Akademi award in 1967 in Tamil language category for his literary criticism Virar Ulagam.

[4] He has written extensive commentaries on many Tamil devotional texts including Kandar Alangaram, Kandar Anubhuthi, Thirumurugattruppadai, Abirami Andathi and Kandar Kalivenba.He has written more than 200 books on various topics in Tamil literature and grammar.

He was a great orator and was popularly known as Vageesa Kalanidhi, a title bestowed on him by Kanchi Paramacharya.