Herat, also known as Harat or Hirat, and historically known as Hira, Harew, Haraiva, Areion, and Horeiva, is an oasis city and the third-largest city in Afghanistan. In 2020, it had an estimated population of 574,276. It is the capital of Herat Province, situated south of the Paropamisus Mountains (Selseleh-ye Safēd Kōh) in the fertile valley of the Hari River in the western part of the country. An ancient civilization on the Silk Road between West Asia, Central Asia, and South Asia, it is a regional hub in the country's west.

Herat dates back to Avestan times and was traditionally known for its wine. The city has a number of historic sites, including the Herat Citadel and the Musalla Complex. During the Middle Ages, Herat became one of the important cities of Khorasan, as it was known as the Pearl of Khorasan. After its conquest by Tamerlane, the city became an important center of intellectual and artistic life in the Islamic world. Under the rule of Shah Rukh, the city served as the focal point of the Timurid Renaissance, whose glory is thought to have matched Florence of the Italian Renaissance as the center of a cultural rebirth. After the fall of the Timurid Empire, Herat has been governed by various Afghan rulers since the early 18th century. In 1716, the Abdali Afghans inhabiting the city revolted and formed their own Sultanate, the Sadozai Sultanate of Herat. They were conquered by the Afsharid Persia in 1732.

After Nader Shah's death and Ahmad Shah Durrani's rise to power in 1747, Herat separated from Persia and became part of Afghanistan. It became an independent city-state in the first half of the 19th century, facing several Qajar Iranian invasions until being incorporated into Afghanistan in 1863. Pashtunzadagan, Darwazekhosh, Ghorian, GhaderGij (QaderGij) and Gozargah are some of the neighborhoods of Herat within the city limits. The roads from Herat to Iran (through the border town of Islam Qala) and Turkmenistan (through the border town of Torghundi) are still strategically important. As the gateway to Iran, it collects high amount of customs revenue for Afghanistan. It also has an international airport. Following the 2001 war, the city had been relatively safe from Taliban insurgent attacks. In 2021, it was announced that Herat would be listed as a UNESCO World Heritage Site. On 12 August 2021, the city was seized by Taliban fighters as part of the Taliban's summer offensive.

The area of Herat, along with areas like Piranshahr, Damghan and Aleppo, are noted to be sites for archaeological interests and exploration.

Ancient

Herat is first recorded in ancient times, but its precise date of foundation is unknown. Under the Persian Achaemenid Empire (550–330 BC), the surrounding district was known by the Old Persian name of Haraiva (𐏃𐎼𐎡𐎺), and in classical sources, the region was correspondingly known as Areia (Aria). In the Zoroastrian collection of Avesta, the district is referred as Haroiva. The name of the district and its principal town is a derivative from that of the local river, the Herey River (from Old Iranian Harayu, meaning "with velocity"), which goes through the district and ends 5 km (3.1 mi) south of Herat. The naming of a region and its principal town after the main river is a common feature in this part of the world— compare the adjoining districts/rivers/towns of Arachosia and Bactria.

The district Aria of the Achaemenid Empire is mentioned in the provincial lists that are included in various royal inscriptions, for instance, in the Behistun inscription of Darius I (ca. 520 BC). Representatives from the district are depicted in reliefs, e.g., at the royal Achaemenid tombs of Naqsh-e Rustam and Persepolis. They are wearing Scythian-style dress (with a tunic and trousers tucked into high boots) and a twisted Bashlyk that covers their head, chin and neck.

Hamdallah Mustawfi, composer of the 14th-century geographical work Nuzhat al-Qulub writes that: