List of Famous people who died at 86

Derrick Henry "Dick" Lehmer, almost always cited as D.H. Lehmer, was an American mathematician significant to the development of computational number theory. Lehmer refined Édouard Lucas' work in the 1930s and devised the Lucas–Lehmer test for Mersenne primes. His peripatetic career as a number theorist, with him and his wife taking numerous types of work in the United States and abroad to support themselves during the Great Depression, fortuitously brought him into the center of research into early electronic computing.

Paul Grimm was a German prehistorian and also a pioneer of Medieval archaeology, especially of the excavation of abandoned villages and castles. Grimm worked on various periods, but mainly in central Germany – the names of two important Neolithic archaeological cultures in the area, the Baalberge group and the Salzmünde group derive from him. His comprehensive excavations in Hohenrode and Tilleda are important milestones in the history of German archaeology.

Ronald F. Inglehart was an American political scientist and professor emeritus at the University of Michigan. He was director of the World Values Survey, a global network of social scientists who have carried out representative national surveys of the publics of over 100 societies on all six inhabited continents, containing 90 percent of the world's population. The first wave of surveys for this project was carried out in 1981 and the latest wave was completed in 2019. Since 2010 Inglehart has also been co-director of the Laboratory for Comparative Social Research at the National Research University - Higher School of Economics in Moscow and St Petersburg. This laboratory has carried out surveys in Russia and eight ex-Soviet countries and is training PhD-level students in quantitative cross-national research methods. Inglehart died on 8 May 2021.

Jocelyn Brando was an American actress and writer. She is best known for her role as Katie Bannion in the film noir The Big Heat (1953).

Bernard Louis Auguste Paul Panafieu pronunciation (help·info)) was a French prelate of the Catholic Church. He was Archbishop of Marseille from 1995 until his retirement in 2006. He was made a cardinal in 2003.

Masakazu Yamazaki was a Japanese writer, literary critic, and philosopher.

Tatu Vanhanen was a Finnish political scientist, sociologist, and writer. He was a professor of political science at the University of Tampere in Tampere, Finland. Vanhanen was a coauthor with Richard Lynn of IQ and the Wealth of Nations (2002) and IQ and Global Inequality (2006), and author of Ethnic Conflicts Explained by Ethnic Nepotism (1999) and many other works.

Ali Squalli Houssaini was the author of the lyrics of the national anthem of Morocco, "Hymne Chérifien", which he wrote in 1970. He was also the author of numerous books.

Ferhat Abbas was an Algerian politician who acted in a provisional capacity as the then yet-to-become independent country's President from 1958 to 1961, as well as the first President of the National Assembly and the first acting President after independence. His political views evolved from pro-French collaboration to those of a revolutionary nationalist, over a period of approximately twenty years.

Kaarlo Jaakko Juhani Hintikka was a Finnish philosopher and logician.