Central Asia is a subregion of Asia that stretches from the Caspian Sea in the southwest and European Russia in the northwest to Western China and Mongolia in the east, and from Afghanistan and Iran in the south to Siberia in the north. It includes Kazakhstan, Kyrgyzstan, Tajikistan, Turkmenistan, and Uzbekistan. The countries as a group are also colloquially referred to as the "-stans" as all have names ending with the Persian suffix "-stan" (meaning "land of") in both respective native languages and most other languages. Central Asia borders Eastern Europe to the west, West Asia to the southwest, South Asia to the southeast, North Asia to the north, and East Asia to the east.

In the pre-Islamic and early Islamic eras (c. 1000 and earlier) Central Asia was inhabited predominantly by Iranian people, populated by Eastern Iranian-speaking Bactrians, Sogdians, Chorasmians, and the semi-nomadic Scythians and Dahae. After expansion by Turkic people, Central Asia also became the homeland for the Uzbeks, Kazakhs, Tatars, Turkmens, Kyrgyz, and Uyghurs; Turkic languages largely replaced the Iranian languages spoken in the area, with the exception of Tajikistan and areas where Tajik is spoken.

The Silk Road trade routes crossed through Central Asia, leading to the rise of prosperous trade cities. acting as a crossroads for the movement of people, goods, and ideas between Europe and the Far East. Most countries in Central Asia are still integral to parts of the world economy.

From the mid-19th century until almost the end of the 20th century, Central Asia was colonised by the Russians, and incorporated into the Russian Empire, and later the Soviet Union, which led to Russians and other Slavs emigrating into the area. Modern-day Central Asia is home to a large population of European settlers, who mostly live in Kazakhstan; 7 million Russians, 500,000 Ukrainians, and about 170,000 Germans. Stalinist-era forced deportation policies also mean that over 300,000 Koreans live there.

Central Asia has a population of about 72 million, in five countries: Kazakhstan (19 million), Kyrgyzstan (7 million), Tajikistan (10 million), Turkmenistan (6 million), and Uzbekistan (35 million).