Sir Herbert Hope Risley (4 January 1851 – 30 September 1911) was a British ethnographer and colonial administrator, a member of the Indian Civil Service who conducted extensive studies on the tribes and castes of the Bengal Presidency. He is notable for the formal identification of the centuries old established caste system of the entire Hindu population of British India in the 1901 census, of which he was in charge. As an exponent of scientific racism, he used anthropometric data to divide Indians into seven races.

Risley was born in Buckinghamshire, England, in 1851 and attended New College, Oxford University prior to joining the Indian Civil Service (ICS). He was initially posted to Bengal, where his professional duties engaged him in statistical and ethnographic research, and he soon developed an interest in anthropology. His decision to indulge these interests curtailed his initial rapid advancement through the ranks of the Service, although he was later appointed Census Commissioner and, shortly before his death in 1911, became Permanent Secretary at the India Office in London. In the intervening years he compiled various studies of Indian communities based on ideas that are now considered to constitute scientific racism. He emphasised the value of fieldwork and anthropometric studies, in contrast to the reliance on old texts and folklore that had historically been the methodology of Indologists and which was still a significant approach in his lifetime.

Aside from being honoured by his country, including by the award of a knighthood, Risley also became President of the Royal Anthropological Institute.

Early life Herbert Hope Risley was born at Akeley in Buckinghamshire, England, on 4 January 1851. His father was a rector and his mother the daughter of John Hope, who had served in the Bengal Medical Service at Gwalior.

During his schooldays at Winchester College, where many of his relatives had preceded him, he won a scholarship and was also awarded a gold medal for an essay in Latin. Continuing his education with a scholarship at New College, Oxford, he graduated with a second-class Bachelor of Arts degree in law and modern history in 1872. He had already passed the competitive examination for the Indian Civil Service (ICS) in 1871, entered it on 3 June 1873 and arrived in India on 24 October of that year.

India: 1873–1885

His initial posting was to Midnapur in Bengal as an Assistant Magistrate and Assistant District Collector. The area was inhabited in part by forest tribes. He soon took to studying them and retained an interest in the anthropology of such tribes for the remainder of his life. He also became involved in William Wilson Hunter's Statistical Survey of India, which began in 1869, and was to be printed in the first edition of The Imperial Gazetteer of India, published in 1881. Hunter personally conducted the survey of Bengal, and the anthropological, linguistic and sociological accomplishments of Risley were recognised in February 1875 when he was appointed as one of five Assistant Directors of Statistics for Hunter's Survey.

Risley compiled the Survey's volume covering the hill districts of Hazaribagh and Lohardaga, and both the literary style and subject knowledge shown in this work were to prove beneficial to his career. He became Assistant Secretary to the Government of Bengal and then, in 1879, was appointed as Under Secretary in the Home Department of the Government of India. In 1880 he returned to work at district level, at Govindpur, having married Elsie Julie Oppermann on 17 June 1879 at Simla. According to Crispin Bates, a historian of modern South Asia, Oppermann was an "erudite German" and her linguistic proficiency helped Risley learn more about anthropology and statistics from non-English sources. The couple had a son and a daughter.

To return to work in the districts was Risley's personal preference and was made despite his unusually rapid rise through the ranks. He went from Govindpur back to Hazaribagh and then, in 1884, to Manbhum, where he was charged with conducting an enquiry into land tenure arrangements.

Ethnographic Survey of Bengal: 1885–1891

In 1885, Risley was appointed to conduct a project titled the Ethnographic Survey of Bengal, which Augustus Rivers Thompson, the Lieutenant-Governor of the Presidency at the time, believed to be a sensible exercise. The Indian Rebellion of 1857 had come close to overturning Company rule in India, and the disruption led the British government to take over administrative control from the British East India Company. Members of the ICS such as Richard Carnac Temple thought that if further discontent were to be avoided, it was necessary to obtain a better understanding of the colonial subjects, particularly those from the rural areas. As time went on, the ethnographic studies and their resultant categorisations were embodied in numerous official publications and became an essential part of the administrative mechanisms of the colonial government; of those categorisations it was caste that was regarded to be, in Risley's words, "the cement that holds together the myriad units of Indian society". The desire for ethnographic studies was expressed by another Raj administrator, Denzil Ibbetson, in his 1883 report on the 1881 census of Punjab:

Risley's survey task was aided when research papers of a recently deceased Indian Medical Service doctor, James Wise, were given to him by the doctor's widow. Wise had researched the people of Eastern Bengal and it was agreed that, after ascertaining the accuracy of his work, his research should be incorporated into Risley's survey results. In return, those volumes of the survey dealing with ethnographic matters would be dedicated to Wise. Further assistance came from the research of Edward Tuite Dalton into the jungle tribes of Chhotanagpur and Assam. Dalton, like Wise, had previously published his efforts but now they would be integrated as a part of a larger whole. Risley was able to deal with the remaining areas of Bengal by making use of a large staff of correspondents who came from disparate backgrounds, such as missionaries, native people and Government officials.

In 1891 Risley published a paper entitled The Study of Ethnology in India. It was a contribution to what Thomas Trautmann, a historian who has studied Indian society, describes as "the racial theory of Indian civilisation". Trautmann considers Risley, along with the philologist Max Müller, to have been leading proponents of this idea which Trautmann notes, however, that the convergence of their theories was not a deliberate collaboration.

In the same year, 1891, the four volumes of The Tribes and Castes of Bengal were published. These contained the results of the Bengal survey, with two volumes comprising an "Ethnographical Glossary", and a further two being of "Anthropometric Data". Risley took advice from William Henry Flower, Director of the Natural History Museum, and William Turner, an Edinburgh anthropologist, in compiling the anthropometric volumes. The work was well received by the public and government alike. In the same year, he was elected an officier of the Académie Française; and in the 1892 New Year Honours he was appointed a Companion of the Indian Empire (CIE). In more recent times, his use of contemporary anthropometric methods has led to his career being described by Bates as "the apotheosis of pseudo-scientific racism", an opinion that is shared by others. The theory now known as scientific racism was prevalent for a century from around the 1840s and had at its heart, says Philip D. Curtin, that "race was one of the principal determinants of attitudes, endowments, capabilities and inherent tendencies among human beings. Race thus seemed to determine the course of human history."

According to Trautmann, Risley believed that ethnologists could benefit from undertaking fieldwork. He quotes Risley saying of ethnologists in India that they had relied too much: Risley also viewed India as an ethnological laboratory, where the continued practice of endogamy had ensured that, in his opinion, there were strict delineations of the various communities by caste and that consequently caste could be viewed as identical to race. Whereas others, such as Ibbetson, considered caste to be best defined as based on occupation, he believed that changes in occupation within a community led to another instance of endogamy "being held by a sort of unconscious fiction to be equivalent to the difference of race, which is the true basis of the system." The study was, in the opinion of William Crooke, another ethnographer of the Raj period, "the first attempt to apply, in a systematic way, the methods of anthropometry to the analysis of the people of an Indian Province." Risley was influenced by the methodology of the French physical anthropologist Paul Topinard, from whose Éléments d'anthropologie générale he had selected several anthropometric techniques, including the nasal index. Topinard believed that this index—a ratio derived from measuring the breadth and height of the nose—could be combined with other cranial measurements to enable a Linnean classification of humans, for which purpose Trautmann said:

Despite his comments regarding the use of literature by anthropologists, Risley used the ancient Rig Veda text, which he interpreted as speaking of Aryan invaders coming into India from the northwest and meeting with existing peoples. Dalton and J. F. Hewitt had posited that the native people comprised two distinct groups, being the Dravidian and the Kolarian, and Risley's use of the nasal index was in part intended to counter those theories by showing that the two groups were racially identical even if they were linguistically varied. Crooke noted that Risley appeared to succeed in proving a physical similarity between "the so-called Dravidian and Kolarian races" and "identified the Austro-Asiatic group of languages, with Munda as one of its sub-branches."

Risley's interpretation of the nasal index went beyond investigation of the two-race theory. He believed that the variations shown between the extremes of those races of India were indicative of various positions within the caste system, saying that generally "the social position of a caste varies inversely as its nasal index." Trautmann explains that Risley "found a direct relation between the proportion of Aryan blood and the nasal index, along a gradient from the highest castes to the lowest. This assimilation of caste to race ... proved very influential." He also saw a linkage between the nasal index and the definition of a community as either a tribe or a Hindu caste and believed that the caste system had its basis in race rather than in occupation, saying "community of race, and not, as has frequently been argued, community of function, is the real determining principle, the true causa causans, of the caste system."

The methods of anthropometric data collection, much of which was done by Risley, have been questioned in more recent times. Bates has said:

India: the 1901 census