Julia the Younger (19 BCE - c. CE 29) or Julilla (little Julia), Vipsania Julia Agrippina, Iulilla, Julia, Augustus' granddaughter, or Julia Caesaris Minor, was a Roman noblewoman of the Julio-Claudian dynasty.

She is the first daughter and second child of Marcus Vipsanius Agrippa and Julia the Elder.

Along with her sister Agrippina the Elder, Julia is raised and educated by her maternal grandfather Augustus and her maternal step-grandmother Livia Drusilla.

Julia the Younger is sister-in-law, stepdaughter and daughter-in-law of the Emperor Tiberius, maternal aunt of the Emperor Caligula and Empress Agrippina the Younger, second cousin of the Emperor Claudius, and maternal great-aunt of the Emperor Nero.