The aim of this master s thesis is to present fundamental aspects of the inventiveness of William Carlos Williams poetry that have fertilized Western poetry since at least the middle of the 20th century. Based on critical considerations, textual analyses and commented translations, the research is organized in seven parts: (I) introduction; (II) biographical sketch; (III) a mapping of Williams reception in Brazil; (IV) theoretical foundation; (V) the struggle for a new form, the formulation of the New Free Verse and first translations; (VI) Williamsian aesthetics of objects and other translations; (VII) final comments and future research. The material intends to provide theoretical, translational and critical tools to approach the work in question, as well as to enrich the repertoire of the Brazilian poetry, since it seeks to fill in major gaps concerning information on and translation of an entire poetic lineage, and illuminating some of the most productive and fruitful aspects of its turning point, the poetry of William Carlos Williams.