Ras (Serbian Cyrillic: Рас; Latin: Arsa), known in modern Serbian historiography as Stari Ras (Serbian Cyrillic: Стари Рас, "Old Ras"), is a medieval fortress and area located in the vicinity of former market-place of Staro Trgovište, some 10–11 kilometers (6.2–6.8 mi) west of modern-day city of Novi Pazar in Serbia.
Old Ras was initially part of the First Bulgarian Empire (until the 10th century), then Byzantine Empire (mid-10th until mid-12th century), in the end becoming one of the first and main capitals of the Grand Principality and Kingdom of Serbia (from mid-12th until early 14th century). Located in today's region of Raška, its favorable position in the area known as Old Serbia, along the Raška gorge at Pešter plateau, on the crossroads and trading routes between neighbouring regions of Zeta and Bosnia in the west and Kosovo in the south, added to its importance as a city.