The Hilliad was Christopher Smart's mock epic poem written as a literary attack upon John Hill on 1 February 1753. The title is a play on Alexander Pope's The Dunciad with a substitution of Hill's name, which represents Smart's debt to Pope for the form and style of The Hilliad as well as a punning reference to the Iliad. In "Book the First" of The Hilliad, Hillario is seduced by a Sibyl to give up his career as an apothecary and instead becomes a writer. However, his fortune quickly descends with Hillario ultimately turning into the "arch-dunce".
The origins of the work come from a dispute between Hill and Henry Fielding; a "paper war" that involved a widespread literary dispute, Hill turned his attention to Smart and published attacks upon Smart's Poems on Several Occasions. In response, Smart wrote The Hilliad, claiming it as the "balance due" on Hill's treatment towards his person and poetry. The work was responded to by multiple parties, but it was the last major contribution of Smart in the literary conflict and attacks upon Smart soon ceased.
Although the work is only of one book that is 259 lines long, its "Notes Variorum" attached to the work more than doubles the length. It is unknown who contributed to the notes, but it is thought that Smart, along with Arthur Murphy and Henry Fielding, put them together.