Pompeia Magna (about 42 BC - ?) was the daughter and only child of political rebel Sextus Pompey and Scribonia. Pompeia was the only child born to the sons of triumvir Pompey. Her paternal grandparents were Pompey and Mucia Tertia. Her maternal grandparents were consul of 34 BC, Lucius Scribonius Libo and an unnamed woman from the gens Sulpicius, the family that the Roman Emperor Galba descended from on his paternal side. Her parents are distantly related. Sextus was a great uncle to her maternal grandfather, which Libo was a son to Cornelia Sulla. Cornelia Sulla was a daughter to Pompeia Magna and Faustus Cornelius Sulla. Pompeia Magna and Sextus Pompeius were siblings.