Much research has been done on various aspects of Miguel de Cervantes’s Don Quijote de la Mancha, but relatively little has been done on the poetry in the novel. There are eighty-two poems or verses in the novel. The present study examines this poetry in terms of the content, form, tradition and function. The opening poems and epitaphs are examined first, followed by the poetry through which characters express their emotions and philosophies. Finally, the paper looks at how the traditions of Spanish ballads (romances) and sonnets (sonetos) have been adopted by the author. Seven poems will be analyzed as examples to show the significance of poetry in Don Quijote.