Nicholas Justin Allen (8 July 1939 – 21 March 2020) was an English physician and social anthropologist who specialized in Indo-European studies.

[1] His thesis was eventually published under the title Miyapma: Traditional Narratives of the Thulung Rai (2015), and is considered a pioneering and fundamental work on the anthropology of Nepal.

Allen was made Reader in the Social Anthropology of South Asia at Wolfson College in 1997, and served as Head of Department.

[3] Allen retired from Wolfson as Emeritus Fellow at the School of Anthropology and Museum Ethnography in 2001, but continued to teach and research.

[3] Allen's research centered on kinship, the anthropology of the Himalayas, Tibeto-Burman languages, peoples and cultures, and Indo-European studies.

[5] Allen was considered one the world's foremost authorities on the comparative study of Indo-European mythology, on which he made significant contributions.