Callista is a novel by the English Catholic theologian, priest and writer St John Henry Newman.
The main character of the novel is Callista, a young and beautiful Greek girl, who has arrived from Greece some years previously with her brother Aristo; they work for Agellius's uncle Jucundus, carving statues of pagan gods.
Agellius soon meets the mysterious Christian priest Caecilius (later identified as St. Cyprian of Carthage), who becomes a father figure for him and strengthens his faith again.
When she is compelled to offer incense to the pagan gods, she has to make a dramatic choice, which finally leads her into the Catholic Church and then to martyrdom.
The novel was commissioned as a sort of "prequel" to Fabiola by Cardinal Nicholas Wiseman, published a year earlier.