Hoysala architecture is the building style in Hindu temple architecture developed under the rule of the Hoysala Empire between the 11th and 14th centuries, in the region known today as Karnataka, a state of India. Hoysala influence was at its peak in the 13th century, when it dominated the Southern Deccan Plateau region. Large and small temples built during this era remain as examples of the Hoysala architectural style, including the Chennakesava Temple at Belur, the Hoysaleswara Temple at Halebidu, and the Kesava Temple at Somanathapura. These three temples were accorded UNESCO world heritage site status in 2023. Other examples of Hoysala craftsmanship are the temples at Belavadi, Amruthapura, Hosaholalu, Mosale, Arasikere, Basaralu, Kikkeri and Nuggehalli. Study of the Hoysala architectural style has revealed a negligible North Indian influence while the impact of Southern Indian style is more distinct.

Temples built prior to Hoysala independence in the mid-12th century reflect significant Western Chalukya influences, while later temples retain some features salient to Western Chalukya architecture but have additional inventive decoration and ornamentation, features unique to Hoysala artisans. Some three hundred temples are known to survive in present-day Karnataka state and many more are mentioned in inscriptions, though only about seventy have been documented. The greatest concentration of these are in the Malnad (hill) districts, the native home of the Hoysala kings.

Hoysala architecture is classified by the influential scholar Adam Hardy as part of the Karnata Dravida tradition, a trend within Dravidian architecture in the Deccan that is distinct from the Tamil style of further south. Other terms for the tradition are Vesara, and Chalukya architecture, divided into early Badami Chalukya architecture and the Western Chalukya architecture which immediately preceded the Hoysalas. The whole tradition covers a period of about seven centuries began in the 7th century under the patronage of the Chalukya dynasty of Badami, developed further under the Rashtrakutas of Manyakheta during the 9th and 10th centuries and the Western Chalukyas (or Later Chalukyas) of Basavakalyan in the 11th and 12th centuries. Its final development stage and transformation into an independent style was during the rule of the Hoysalas in the 12th and 13th centuries. Medieval inscriptions displayed prominently at temple locations give information about donations made toward the maintenance of the temple, details of consecration and on occasion, even architectural details.

Hinduism is a combination of secular and sacred beliefs, rituals, daily practices and traditions that has evolved over the course of over two thousand years and embodies complex symbolism combining the natural world with philosophy.

Hindu temples began as simple shrines housing a deity and by the time of the Hoysalas had evolved into well-articulated edifices in which worshippers sought transcendence of the daily world. Hoysala temples were not limited to any specifically organised tradition of Hinduism and encouraged pilgrims of different Hindu devotional movements. The Hoysalas usually dedicated their temples to Shiva or Vishnu (two of the popular Hindu gods), but they occasionally built some temples dedicated to the Jain faith as well. Worshippers of Shiva are called Shaivas and worshippers of Vishnu are called Vaishnavas. While King Vishnuvardhana and his descendants were Vaishnava by faith, records show that the Hoysalas maintained religious harmony by building as many temples dedicated to Shiva as they did to Vishnu.

Most of these temples have secular features with broad themes depicted in their sculptures. This can be seen in the famous Chennakesava Temple at Belur dedicated to Vishnu and in the Hoysaleswara temple at Halebidu dedicated to Shiva. The Kesava temple at Somanathapura is different in that its ornamentation is strictly Vaishnava. Generally Vaishnava temples are dedicated to Keshava (or to Chennakeshava, meaning "Beautiful Vishnu") while a small number are dedicated to Lakshminarayana and Lakshminarasimha (Narayana and Narasimha both being Avatars, or physical manifestations, of Vishnu) with Lakshmi, consort of Vishnu, seated at his feet. Temples dedicated to Vishnu are always named after the deity.

The Shaiva temples have a Shiva linga, symbol of fertility and the universal symbol of Shiva, in the shrine. The names of Shiva temples can end with the suffix eshwara meaning "Lord of". The name "Hoysaleswara", for instance, means "Lord of Hoysala". The temple can also be named after the devotee who commissioned the construction of the temple, an example being the Bucesvara temple at Koravangala, named after the devotee Buci. The most striking sculptural decorations are the horizontal rows of mouldings with detailed relief, and intricately carved images of gods, goddesses and their attendants on the outer temple wall panels.

The Doddagaddavalli Lakshmi Devi ("Goddess of Wealth") Temple is an exception as it is dedicated to neither Vishnu nor Shiva. The defeat of the Jain Western Ganga Dynasty (of present-day south Karnataka) by the Cholas in the early 11th century and the rising numbers of followers of Vaishnava Hinduism and Virashaivism in the 12th century was mirrored by a decreased interest in Jainism. However, two notable locations of Jain worship in the Hoysala territory were Shravanabelagola and Kambadahalli. The Hoysalas built Jain temples to satisfy the needs of its Jain population, a few of which have survived in Halebidu containing icons of Jain tirthankaras. They constructed stepped wells called Pushkarni or Kalyani, the ornate tank at Hulikere being an example. The tank has twelve minor shrines containing Hindu deities.