Krishnaism (also Bhagavatism) is a group of Hindu denominations within Vaishnavism, centered on devotion to Radha Krishna or other forms of Krishna, identified with Vishnu.

The central text of Krishnaism is the Bhagavad Gita.

Out of many deities, Krishna is particularly important, and Vaishnava traditions are generally centered either on Vishnu or on Krishna as Svayam Bhagavan ("the Lord Himself"). The term "Krishnaism" has been used to describe the sects focussed on Krishna, while "Vaishnavism" for sects focusing on Vishnu in which Krishna is an Avatar, rather than a transcended Supreme Being.

Krishnaism originates in the early centuries CE, arising from an amalgamation of the heroic Krishna Vasudeva, the "divine child" Bala Krishna and the Gopala traditions, and syncretism of these non-Vedic traditions with the Mahabharata canon, thus affiliating itself with Vedism in order to become acceptable to the orthodox establishment. Krishnaism becomes associated with bhakti yoga in the medieval period. Friedhelm Hardy in his "Viraha-bhakti" analyses the history of Krishnaism, specifically all pre-11th century sources starting with the stories of Krishna and the gopi, and Mayon mysticism of the Vaishnava Tamil saints, Sangam Tamil literature and Alvars' Krishna-centered devotion in the rasa of the emotional union and the dating and history of the Bhagavata Purana.

Abhay Charanaravinda Bhaktivedanta Swami Prabhupada (Bengali: অভয চরণারবিন্দ ভক্তিবেদান্ত স্বামীপ্রভুপাদ, Sanskrit: अभय चरणारविन्द भक्तिवेदान्त स्वामी प्रभुपादः, abhaya-caraṇāravinda bhakti-vedānta svāmī prabhupāda) (1 September 1896 – 14 November 1977) was a Gaudiya Vaishnava teacher and the founder-acharya of the International Society for Krishna Consciousness, commonly known as the "Hare Krishna Movement". His mission was to propagate Gaudiya Vaishnavism, a form of Hinduism that had been taught to him by his guru, Bhaktisiddhanta Sarasvati, throughout the world. Born Abhay Charan De in Calcutta, he was educated at the prestigious local Scottish Church College. Before adopting the life of a pious renunciant (vanaprastha) in 1950, he was married with children and owned a small pharmaceutical business. In 1959 he took a vow of renunciation (sannyasa) and started writing commentaries on Vaishnava scriptures. In his later years, as a traveling Vaishnava monk, he became an influential communicator of Gaudiya Vaishnava theology to India and specifically to the West through his leadership of the International Society for Krishna Consciousness (ISKCON), founded in 1966. As the founder of ISKCON, he "emerged as a major figure of the Western counterculture, initiating thousands of young Americans." Despite attacks from anti-cult groups, he received a favorable welcome from many religious scholars, such as J. Stillson Judah, Harvey Cox, Larry Shinn and Thomas Hopkins, who praised Bhaktivedanta Swami's translations and defended the group against distorted media images and misinterpretations. In respect to his achievements, religious leaders from other Gaudiya Vaishnava movements have also given him credit.