Qus (Arabic: قوص, derived from Ancient Egyptian Gesa or Gesy) is a city in the modern Qena Governorate, Egypt, located on the east bank of the Nile. Its modern name is one of many borrowings in Egyptian Arabic from Coptic, the last living phase of Ancient Egyptian. In Graeco-Roman times, it was called Apollonopolis Parva or Apollinopolis Parva (Greek: Ἀπόλλωνος ἡ μικρά; Ἀπόλλων μικρός), or Apollonos minoris.
Qus must have been an important city in the early part of Egyptian history. This was probably because at that time it served as the point of departure for expeditions to the Red Sea. The city gradually lost its importance, only to regain it in the 13th century with the opening of an alternate commercial route to the Red Sea. Qus since replaced Qift as the primary commercial center for trading with Africa, India, and Arabia. It thus became the second most important Islamic city in medieval Egypt, after Cairo.
The modern population of Qus is around 300,000.