Vihāra generally refers to a Buddhist temple or Buddhist monastery for Buddhist renunciates, mostly in the Indian subcontinent. The concept is ancient and in early Pali texts, it meant any arrangement of space or facilities for dwellings. The term evolved into an architectural concept wherein it refers to living quarters for monks with an open shared space or courtyard, particularly in Buddhism. The term is also found in Jain monastic literature, usually referring to temporary refuge for wandering monks or nuns during the annual Indian monsoons. In modern Jainism, the monks continue to wander from town to town except during the rainy season (chaturmasya), and the term "vihara" refers to their wanderings.

Vihara or vihara hall has a more specific meaning in the architecture of India, especially ancient Indian rock-cut architecture. Here it means a central hall, with small cells connected to it, sometimes with beds carved from the stone. Some have a shrine cell set back at the centre of the back wall, containing a stupa in early examples, or a Buddha statue later. Typical large sites such as the Ajanta Caves, Aurangabad Caves, Karli Caves, and Kanheri Caves contain several viharas. Some included a chaitya or worship hall nearby. The vihara originated as a shelter for monks when it rains.

The word means a form of rest house, temple or monastery in ascetic traditions of India, particularly for a group of monks. It particularly referred to a hall that was used as a temple or where monks met and some walked about. In the context of the performative arts, the term means the theatre, playhouse, convent or temple compound to meet, perform or relax in. Later it referred to a form of temple or monastery construction in Buddhism and Jainism, wherein the design has a central hall and attached separated shrines for residence either for monks or for deities and sacred figure such as Tirthankaras, Gautama Buddha. The word means a Jain or Buddhist temple or "dwelling, waiting place" in many medieval era inscriptions and texts, from vi-har which means "to construct".

It contrasts with Sanskrit: araṇya or Pali: arañña, which means "forest". In medieval era, the term meant any monastery, particularly for Buddhist monks. Matha is another term for monastery in the Buddhist tradition, today normally used for Hindu establishments.

The eastern Indian state of Bihar derives its name from vihāra due to the abundance of Buddhist monasteries in that area. The word has also been borrowed in Malay as biara, denoting a monastery or other non-Muslim place of worship. It is called a wihan (วิหาร) in Thai, and vĭhéar (វិហារ [ʋihiə]) in Khmer. In Burmese, wihara (ဝိဟာရ [wḭhəɹa̰]), means "monastery", but the native Burmese word kyaung (ကျောင်း [tɕáʊɰ̃]) is preferred. Monks wandering from place to place preaching and seeking alms often stayed together in the sangha.^{[citation needed]} In the Punjabi language, an open space inside a home is called a vehra.

In Korea, Japan, Vietnam and China, the word for a Buddhist temple or monastery seems to have a different origin. The Japanese word for a Buddhist temple is Tera (寺), it was anciently also written phonetically 天良 tera, and it is cognate with the Modern Korean Chǒl from Middle Korean Tiel, the Jurchen Taira and the reconstructed Old Chinese ^*dɘiaʁ, all meaning "Buddhist Monastery". These words are apparently derived from the Aramaic word for "monastery" dērā/ dairā/ dēr (from the root dwr "to live together"), rather than from the unrelated Indian word for monastery vihara, and may have been transmitted to China by the first Central Asian translators of Buddhist scriptures, such as An Shigao or Lokaksema.

During the 3rd-century BCE era of Ashoka, vihara yatras were travel stops aimed at enjoyments, pleasures and hobbies such as hunting. These contrasted with dharma yatras which related to religious pursuits and pilgrimage. After Ashoka converted to Buddhism, states Lahiri, he started dharma yatras around mid 3rd century BCE instead of hedonistic royal vihara yatras.

The early history of viharas is unclear. Monasteries in the form of caves are dated to centuries before the start of the common era, for Ajivikas, Buddhists and Jainas. The rock-cut architecture found in cave viharas from the 2nd-century BCE have roots in the Maurya Empire period. In and around the Bihar state of India are a group of residential cave monuments all dated to be from pre-common era, reflecting the Maurya architecture. Some of these have Brahmi script inscription which confirms their antiquity, but the inscriptions were likely added to pre-existing caves. The oldest layer of Buddhist and Jain texts mention legends of the Buddha, the Jain Tirthankaras or sramana monks living in caves. If these records derived from an oral tradition accurately reflect the significance of monks and caves in the times of the Buddha and the Mahavira, then cave residence tradition dates back to at least the 5th century BCE. According to Allchin and Erdosy, the legend of First Buddhist Council is dated to a period just after the death of the Buddha. It mentions monks gathering at a cave near Rajgiri, and this dates it in pre-Mauryan times. However, the square courtyard with cells architecture of vihara, state Allchin and Erdosy, is dated to the Mauryan period. The earlier monastic residences of Ajivikas, Buddhists, Hindus, and Jains were likely outside rock cliffs and made of temporary materials and these have not survived.