The Tragicomedy of Calisto and Melibea (Spanish: Tragicomedia de Calisto y Melibea), known in Spain as La Celestina, is a work entirely in dialogue published in 1499. Sometimes called in English The Spanish Bawd, it is attributed to Fernando de Rojas, a descendant of converted Jews, who practiced law and, later in life, served as an alderman of Talavera de la Reina, an important commercial center near Toledo.

The book is considered to be one of the greatest works of all Spanish literature and is even the single topic of a Spanish literary journal, Celestinesca. La Celestina is usually regarded as marking the end of the medieval period and the beginning of the renaissance in Spanish literature. Although usually regarded as a novel, it is written as a continuous series of dialogues and can be taken as a play, having been staged as such and filmed.

The story tells of a bachelor, Calisto, who uses the old procuress and bawd Celestina to start an affair with Melibea, an unmarried girl kept in seclusion by her parents. Though the two use the rhetoric of courtly love, sex — not marriage — is their aim. When he dies in an accident, she commits suicide. The name Celestina has become synonymous with "procuress" in Spanish, especially an older woman used to further an illicit affair, and is a literary archetype of this character, the masculine counterpart being Pandarus.

While chasing his falcon through the fields, a rich young bachelor named Calisto enters a garden where he meets Melibea, the daughter of the house, and is immediately taken with her. Unable to see her again privately, he broods until his servant Sempronio suggests using the old procuress Celestina. She is the owner of a brothel and in charge of her two young employees, Elicia and Areúsa.

When Calisto agrees, Sempronio plots with Celestina to make as much money out of his master as they can. Another servant of Calisto's, Pármeno, mistrusts Celestina because he used to work for her when he was a child. Pármeno warns his master not to use her. However Celestina convinces Pármeno to join her and Sempronio in taking advantage of Calisto. His reward is Areúsa.

As a seller of feminine knick-knacks and quack medicines, Celestina is permitted entrance into the home of Alisa and Melibea by pretending to sell thread. Upon being left alone with Melibea, Celestina tells her of a man in pain who could be cured by the touch of her girdle. When she mentions Calisto's name, Melibea becomes angry and tells her to go. But the crafty Celestina persuades her that Calisto has a horrible toothache that requires her aid, and manages to get the girdle off her and to fix another meeting.

On her second visit, Celestina persuades the now willing Melibea to a rendezvous with Calisto. Upon hearing of the meeting set by Celestina, Calisto rewards the procuress with a valuable gold chain. The lovers arrange to meet in Melibea's garden the following night, while Sempronio and Pármeno keep watch.

When the weary Calisto returns home at dawn to sleep, his two servants go round to Celestina's house to get their share of the gold. She tries to cheat them and in rage they kill her in front of Elicia. After jumping out of the window in an attempt to escape the Night Guard, Sempronio and Pármeno are caught and are beheaded later that day in the town square. Elicia, who knows what happened to Celestina, Sempronio, and Pármeno, tells Areúsa of the deaths. Areúsa and Elicia come up with a plan to punish Calisto and Melibea for being the cause of Celestina, Sempronio, and Pármeno's downfall.