Ayussinte Pusthakam (English: The Book of Life) (Malayalam: ആയുസ്സിന്റെ പുസ്തകം) is a well-known Indian Malayalam language novel by C. V. Balakrishnan. The novel was adapted into an experimental play by Suveeran. The play received Kerala Sangeeta Nataka Akademi Award of 2008, and participated in several international festivals.
Balakrishnan began writing this novel when he moved to Calcutta in late-1970s. An old edition of the Bible at St. Paul's Cathedral in Calcutta triggered the book in him. It took him three years to complete the novel. Says the author: "All the characters and villages of Christian settlers were in my mind long before I began thinking about writing Ayussinte Pusthakam. The characters are based on people I met during my course as a school teacher in a village in Kasaragod. I wrote Ayussinte Pusthakam at a time when I was going through an emotionally difficult period; my relation with my father was strained and I was feeling very lonely. Ayussinte Pusthakam is about loneliness. The book is also about sin and sadness, written in a style and language that have been judiciously borrowed from The Bible." The protagonist in this novel is Yohannan, and the plot revolves around his ambiguities concerning sexual desire.