Bamyan (Pashto, Dari: بامیان), also spelled Bamiyan, Bāmīān or Bāmyān, is one of the 34 provinces of Afghanistan with the city of Bamyan as its center, located in central parts of Afghanistan.

The terrain in Bamyan is mountainous or semi-mountainous, at the western end of the Hindu Kush mountains concurrent with the Himalayas. The province is divided into eight districts, with the town of Bamyan serving as its capital. The province has a population of about 495,557 and borders Samangan to the north, Baghlan, Parwan, and Maidan Wardak to the east, Ghazni and Daikundi to the south, and Ghor and Sar-e-Pol to the west. It is the largest province in the Central region of Afghanistan.

It was a center of commerce and Buddhism in the 4th and 5th centuries. In antiquity, central Afghanistan was strategically placed to thrive from the Silk Road caravans that crisscrossed the region, trading between the Roman Empire, Han dynasty, Central Asia, and South Asia. Bamyan was a stopping-off point for many travelers. It was here that elements of Greek and Buddhist art were combined into a unique classical style known as Greco-Buddhist art.

The province has several famous historical sites, including the now-destroyed Buddhas of Bamiyan, around which are more than 3,000 caves, the Band-e-Amir National Park, Dara-e-Ajhdar, Gholghola, and Zuhak ancient towns, the Feroz Bahar, Astopa, Klegan, Gaohargin, Kaferan, and Cheldukhtaran.

Archaeological exploration done in the 20th century suggests that the geographical area of Afghanistan has been closely connected by culture and trade with its neighbors to the east, west, and north. Artifacts typical of the Paleolithic, Mesolithic, Neolithic, Bronze, and Iron Ages have been found in Afghanistan. Urban civilization is believed to have begun as early as 3000 BC, and the early city of Mundigak (near Kandahar in the south of the country) may have been a colony of the nearby Indus Valley civilization.

After 2000 BC, successive waves of semi-nomadic people from Central Asia began moving south into Afghanistan; among them were many Indo-European-speaking Indo-Iranians. These tribes later migrated further south to India, west to what is now Iran, and towards Europe via the area north of the Caspian Sea. The region as a whole was called Ariana.

The people shared similar culture with other Indo-Iranians. The ancient religion of Kafiristan survived here until the 19th century. Another religion, Zoroastrianism is believed by some to have originated in what is now Afghanistan between 1800 and 800 BC, as its founder Zoroaster is thought to have lived and died in Balkh. Ancient Eastern Iranian languages may have been spoken in the region around the time of the rise of Zoroastrianism.

By the middle of the 6th century BC, the Achaemenid Persians overthrew the Medes and incorporated Arachosia, Aria, and Bactria within its eastern boundaries. An inscription on the tombstone of King Darius I of Persia mentions the Kabul Valley in a list of the 29 countries that he had conquered.