Via Severiana was an ancient Roman road in central Italy leading from Latium to Campania (and now in Lazio), running southeast from Ostia to Terracina, a distance of 80 Roman miles (c. 118 km) along the coast. It took its name from the restoration of already existing roads, carried out during the reign of emperor Septimius Severus (198 AD).
It ran along the shore at first, just behind the line of villas which fronted upon the sea, and are now some 1 km inland, or even upon its edge (for an inscription records its being damaged by the waves). Farther southeast it seems to have kept rather more distant from the shore, and it probably kept within the lagoons below the Circean promontory. Cities connected by the Via Severiana included Portus (the starting point), Ostia, Laurentum, Lavinium, Anzio (Antium), Astura (modern Torre Astura) and Terracina.
Remains of the via Severiana are scanty. There are the remains of at least one Roman bridge along the road, which crosses the Numicus two km southeast of Ostia.