Scythia was a geographic region defined in the ancient Graeco-Roman world that encompassed the Pontic–Caspian steppe. It was inhabited by Scythians, an ancient Eastern Iranian equestrian nomadic people.

The Scythians were an ancient Eastern Iranic equestrian nomadic people who had migrated during the 9th to 8th centuries BC from Central Asia to the Pontic Steppe in modern-day Ukraine and Southern Russia, where they remained established from the 7th century BC until the 3rd century BC.

Skilled in mounted warfare, the Scythians replaced the Agathyrsi and the Cimmerians as the dominant power on the western Eurasian Steppe in the 8th century BC. In the 7th century BC, the Scythians crossed the Caucasus Mountains and frequently raided West Asia along with the Cimmerians.

After being expelled from West Asia by the Medes, the Scythians retreated back into the Pontic Steppe in the 6th century BC, and were later conquered by the Sarmatians in the 3rd to 2nd centuries BC. By the 3rd century AD, last remnants of the Scythians were overwhelmed by the Goths, and by the early Middle Ages, the Scythians were assimilated and absorbed by the various successive populations who had moved into the Pontic Steppe.

After the Scythians' disappearance, authors of the ancient, mediaeval, and early modern periods used their name to refer to various populations of the steppes unrelated to them.