Harald E. L. Prins (born 1951) is a Dutch anthropologist, ethnohistorian, filmmaker, and human rights activist specialized in North and South America's indigenous peoples and cultures.

During a decade of applied anthropology among Maine Indians as Director of Research and Development for the Association of Aroostook Indians (1981–1982), and as tribal anthropologist for the Aroostook Band of Micmacs (1982–1990), he was instrumental in helping this impoverished and landless indigenous community win federal recognition of its tribal status and a 5,000-acre (20 km2) land base in northern Maine..[1] He also served as Expert Witness on native rights in the United States Senate (1989) and in several Canadian courts (1996, 2000), and was an international observer in the presidential elections of Paraguay (1993).

Since 2013, he has served as lead expert witness on riverine sovereignty and tribal reservation boundaries for the Penobscot Indian Nation in a U.S. federal court case.

He served as guest curator and was subsequently a research associate at the National Museum of Natural History, Smithsonian Institution in Washington DC (2003-2011).

[2] Son of Dutch maritime anthropologist A. H. J. Prins[3] and godson of Kikuyu and Swahili specialist Harold E. Lambert, Senior District Commissioner in British colonial Kenya, he is married to American author and journalist Bunny McBride.