List of Famous people who died in 1923

John Venn, FRS, FSA was an English mathematician, logician and philosopher noted for introducing the Venn diagrams, which are used in logic, set theory, probability, statistics, and computer science. In 1866, Venn published The Logic of Chance, a ground-breaking book which espoused the frequency theory of probability, arguing that probability should be determined by how often something is forecast to occur as opposed to “educated” assumptions. Venn then further developed George Boole's theories in the 1881 work Symbolic Logic, where he highlighted what would become known as Venn diagrams.

Niccolò Marini was an Italian Cardinal of the Catholic Church who served as secretary of the Congregation for the Oriental Churches from 1917 to 1922, and was elevated to the cardinalate in 1916.

Edward Emerson Barnard was an American astronomer. He was commonly known as E. E. Barnard, and was recognized as a gifted observational astronomer. He is best known for his discovery of the high proper motion of Barnard's Star in 1916, which is named in his honor.

Paul Dominique Philippoteaux was a French artist. He is best known for a cyclorama illustrating the Battle of Gettysburg.

Gustave-Claude-Étienne Courtois, also known as Gustave Courtois was a French painter, a representative of the academic style of art.

Prince Miguel of Braganza, Duke of Viseu was a member of the exiled branch of the House of Braganza. The eldest son of the Miguelist pretender to the throne of Portugal he married an American heiress in 1909 and in 1920 renounced his rights to the throne. His full given names were Miguel Maria Sebastião Maximiliano Rafael Gabriel Gonzaga Francisco D'Assis e de Paula Eustachio Carlos Afonso José Henrique Alberto Clemente Ignacio Martinho Antonio Gerardo Jorge Emmeric Mauricio.

Hendrik Pierson was a Dutch Lutheran minister and member of the Réveil religious revival movement. He was president of the Ottho Gerhard Heldringstichting, an asylum for reformed prostitutes, from 1877 to 1914. He was one of the leaders of the campaign to abolish state regulation of prostitution, and in 1898 became president of the International Abolitionist Federation..