List of Famous people who died in 1966

Gwendolen Florence Mary Guinness, Countess of Iveagh was an Anglo-Irish aristocrat and Conservative politician. She was, by marriage, a member of the Guinness brewing dynasty.

Luitzen Egbertus Jan Brouwer, usually cited as L. E. J. Brouwer but known to his friends as Bertus, was a Dutch mathematician and philosopher, who worked in topology, set theory, measure theory and complex analysis. He is known as the founder of modern topology, particularly for establishing his fixed-point theorem and the topological invariance of dimension.

Hans Christian Branner was a Danish novelist, essayist and playwright. He was a leading writer of the post-World War II period in Denmark and a founder member of the Danish Academy. His work dealt with the themes of power, fear and loneliness and earned him several literary awards including De Gyldne Laurbær, the Holberg Medal (1954) and the Danish Playwrights' Honorary Award (1961).

Jan Martel is the name of:

• Jan Martel (sculptor) (1896–1966), French sculptor
• Jan Martel (bridge) American bridge player

Pietro Ciriaci was an Italian Cardinal of the Catholic Church who served as prefect of the Sacred Congregation of the Council in the Roman Curia from 1954 until his death, and was elevated to the cardinalate in 1953 by Pope Pius XII.