Religion in Thailand has historically been centered on Theravāda Buddhism, which serves as the spiritual foundation of Thai society and culture. Introduced through early Indian influence and later consolidated during the Sukhothai and Ayutthaya periods, Buddhism in Thailand emphasizes merit-making, monastic life, and close ties between religion and the state. The Thai monarchy has long positioned itself as the protector of the faith, reinforcing its legitimacy through religious patronage. Alongside Buddhism, the institution of Royal Brahmins—descendants of Hindu priests—has played an important ceremonial role at the royal court, conducting ancient Brahmanical rites that date back to early Indianized kingdoms. These rituals, such as coronations and royal ploughing ceremonies, reflect a unique synthesis of Buddhist beliefs and Hindu traditions within the Thai state.

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Beyond the Buddhist majority, Thailand is home to a diverse range of minority religions that contribute to its cultural landscape. Islam is the second-largest religion, particularly prominent in the southern provinces, where long-standing Malay-Muslim communities maintain distinct traditions. Christianity, introduced by European missionaries from the 16th century onward, has established a modest but influential presence, especially in education and healthcare. Taoism and Chinese folk religions are practiced among Thai-Chinese communities, often blending with local beliefs and ancestor worship. Meanwhile, Hinduism, though small in terms of adherents, continues to exert a significant cultural and symbolic influence, visible in religious shrines, artistic motifs, and its enduring role in royal and state ceremonies.