Akilattirattu Ammanai அகிலத்திரட்டு அம்மானை (Tamil: akilam (world) + thirattu (collection) + ammanai (ballad)), also called Thiru Edu (venerable book), is the main religious book of the Southern Indian religion Ayyavazhi, officially considered as an offshoot of Hinduism. The title is often abbreviated to Akilam.
According to the book, Akilam, Hari Gopalan Citar wrote this book on the twenty-seventh day of the Tamil month of Karthikai (November/December) in the year 1841 CE. The author claims that God woke him up during his sleep and commissioned him to take dictation from what he said. Akilathirattu was recorded on palm leaves until 1939, when it was given printed form.
Akilam is in two parts; the first is an account of the ages preceding that of the present age, the Kali Yukam, and the second is an account of the activities of Ayya Vaikundar leading up to his attaining Vaikundam.
Akilathirattu is written as a poem in the Tamil language. The narration alternates between two subgenres called viruttam and natai. Both subgenres employ many poetic devices like alliteration and hyperbatons. It contains more than 15,000 lines making up seventeen section.