Book of Mercy is a poetry book by Canadian author, poet and singer-songwriter Leonard Cohen, published by McClelland & Stewart. Its original publication was in 1984.

Book of Mercy is considered a companion volume to Cohen's poetry collection, Book of Longing (published in 2006). The book is often referred to as a book of contemporary psalms. The poems are numbered rather than titled.

Book of Mercy contains fifty poems. The topics are often spiritual or religious in nature.