Publius Septimius Geta (fl. 2nd century, c. 110 – 171) was the father of the emperor Lucius Septimius Severus, father-in-law of the Roman empress Julia Domna and the paternal grandfather of Roman emperors Caracalla and Geta. Besides mentions in the Historia Augusta, Geta is known from several inscriptions, two of which were found in Leptis Magna, Africa (East of Tripoli in modern Libya).
Geta was of Libyco-Berber origin. His family were local, wealthy and distinguished in Leptis Magna. His father, Lucius Septimius Severus (c. 70 – aft. 110) was sufes and prefectus when Lepcis was made a colonia and its inhabitants were granted citizenship under Trajan; Lucius was the first duumvir of the new colonia (IRT 412). He is likely the wealthy equestrian that is highly commemorated by the Flavian dynasty poet Statius (Silvae 4.5, 4.praef.). Geta's paternal grandparents were Marcus Septimius Aper (born c. 35), and Octavia. Geta also had a sister named Septimia Polla, who apparently never married; Geta honored her memory with a silver statue.
While Geta seems to have held no political offices, either local or imperial, other members of his family were distinguished. He had two cousins, who served as Consuls under Roman Emperor Antoninus Pius: Gaius Septimius Severus, suffect consul in 160; and Publius Septimius Aper, suffect consul in July 153. Another relative of his was Lucius Septimius Severus Aper, ordinary consul in 207.