Vala, or The Four Zoas is one of the uncompleted prophetic books by the English poet William Blake, begun in 1797. The eponymous main characters of the book are the Four Zoas, who were created by the fall of Albion in Blake's mythology. It consists of nine books, referred to as "nights". These outline the interactions of the Zoas, their fallen forms and their Emanations. Blake intended the book to be a summation of his mythic universe but, dissatisfied, he abandoned the effort in 1807, leaving the poem in a rough draft and its engraving unfinished. The text of the poem was first published, with only a small portion of the accompanying illustrations, in 1893, by the Irish poet W. B. Yeats and his collaborator, the English writer and poet Edwin John Ellis, in their three-volume book The Works of William Blake.

William Blake was an English poet, painter, and printmaker. Largely unrecognised during his life, Blake is now considered a seminal figure in the history of the poetry and visual art of the Romantic Age. What he called his "prophetic works" were said by 20th-century critic Northrop Frye to form "what is in proportion to its merits the least read body of poetry in the English language". While he lived in London his entire life, except for three years spent in Felpham, he produced a diverse and symbolically rich collection of works, which embraced the imagination as "the body of God", or "human existence itself".