India House was a student residence that existed between 1905 and 1910 at Cromwell Avenue in Highgate, North London. With the patronage of lawyer Shyamji Krishna Varma, it was opened to promote nationalist views among Indian students in Britain. The building rapidly became a hub for political activism, one of the most prominent for overseas revolutionary Indian nationalism. "India House" came to informally refer to the nationalist organisations that used the building at various times.
Patrons of India House published an anti-colonialist newspaper, The Indian Sociologist, which the British Raj banned as "seditious". A number of prominent Indian revolutionaries and nationalists were associated with India House, including Vinayak Damodar Savarkar, Bhikaji Cama, V.N. Chatterjee, Lala Har Dayal, V.V.S. Aiyar, M.P.T. Acharya and P.M. Bapat. In 1909, a member of India House, Madan Lal Dhingra, assassinated Sir W.H. Curzon Wyllie, political aide-de-camp to the Secretary of State for India.
The investigations by Scotland Yard and the Indian Political Intelligence Office that followed the assassination sent the organisation into decline. A crackdown on India House activities by the Metropolitan Police prompted a number of its members to leave Britain for France, Germany and the United States. Many members of the house were involved in revolutionary conspiracies in India. The network created by India House played a key part in the Hindu–German Conspiracy for nationalist revolution in India during World War I. In the coming decades, India House alumni went on to playing a leading role in the founding of Indian communism and Hindu nationalism.