This series primarily consists of correspondence received by Pizarnik, with a small selection of letters written by her to others. The majority of correspondents wrote one to three letters, with only very few writing more than five. Correspondents include friends and Latin American literary figures such as Antonio Beneyto, Adolfo Bioy Cásares, Jorge Luis Borges, Ivonne Bordelois, Julio Cortázar, Olga Orozco, Manuel Mujica Láinez, Silvina Ocampo [de Bioy], Victoria Ocampo, Octavio Paz, and André Pieyre de Mandiargues. The letter by Pizarnik to Miguel Otero Silva includes a photo of the poet and two manuscripts. This series is organized alphabetically by correspondent, and then chronologically by date. All undated or partially dated letters are located at the beginning of the corresponding folder or correspondent section within the general folders.

All the correspondence identified in this series is addressed to Alejandra Pizarnik unless otherwise indicated.