Hindu reform movements
Contemporary groups, collectively termed Hindu reform movements, reform Hinduism, Neo-Hinduism, or Hindu revivalism, strive to introduce regeneration and reform to Hinduism, both in a religious or spiritual and in a societal sense. The movements started appearing during the Bengali Renaissance. History

From the 18th century onward India was being colonialised by the British. This colonialisation had a huge impact on Indian society, where social and religious leaders tried to assimilate the western culture and modernise Hindu culture. Social reform movements
In social work, Swami Vivekananda, Dayananda Saraswati, Mahatma Gandhi, Vinoba Bhave, Baba Amte and Prabhat Ranjan Sarkar have been most important. Sunderlal Bahuguna created the chipko movement for the preservation of forestlands according to the Hindu ecological ideas. The less accessible Vedas were rejected and parallel Vachanas were compiled. Religious movements

Brahmo Samaj
The Brahmo Samaj is a social and religious movement founded in Kolkata in 1828 by Raja Ram Mohan Roy. The Brahmo Samaj movement thereafter resulted in the Brahmo religion in 1850 founded by Debendranath Tagore, better known as the father of Rabindranath Tagore. Brahmo Samaj of South India 
The faith and Principles of Brahmo Samaj had spread to South Indian states like Andhra Pradesh, Tamil Nadu, Karnataka, and Kerala with many followers. In Kerala the faith and principles of Brahmosamaj and Raja Ram Mohun Roy had been propagated by Ayyathan Gopalan, and reform activities had been led by establishing Brahmosamaj in 1898 in the Calicut (now Kozhikode) region. Gopalan was a doctor by profession, but dedicated his life to Brahmosamaj, and was an active executive member of the Calcutta Sadharan Brahmosamaj until his death. Arya Samaj
The Arya Samaj is a monotheistic Hindu reform movement founded in India by Maharshi Dayananda in 1875 at Bombay. He was an ascetic who believed in the infallible authority of the Vedas. It aimed to be a universal structure based on the authority of the Vedas. Dayananda stated that he wanted 'to make the world noble', i.e., to return Hinduism to its universality of the Vedas. To this end, the Arya Samaj started Shuddhi movement in early 20th century to bring back Hinduism to people converted to Islam and Christianity, set up schools and missionary organisations, and extended its activities outside India. Jawaharlal Nehru, the first prime minister of India in his book, The Discovery of India credits Arya Samaj in introducing proselytization in Hinduism. Ramakrishna Movement

Swami Vivekananda was a central personality in the development of another stream of Hinduism in late 19th century and the early 20th century that reconciled the devotional (bhakti-märga) path of his guru Sri Ramakrishna (of the Puri dashanami sampradäya) with the gnana märga (path of knowledge). His ideals and sayings have inspired numerous Indians as well as non-Indians, Hindus as well as non-Hindus. Among the prominent figures whose ideals were very much influenced by them were Rabindranath Tagore, Gandhi, Subhas Bose, Satyendranath Bose, Megh Nad Saha,  Sister Nivedita, and Sri Aurobindo. 