"O alienista" (translated as "The Psychiatrist" then "The Alienist") is a satiric novella written by the Brazilian author Machado de Assis (1839–1908). The story ran in Rio de Janeiro's newspaper A Estação (from 15 October 1881 to 15 March 1882), then was published in 1882 as part of the author's short-story collection Papéis avulsos ("Single Papers"). An English translation was published in 1963.

In 1970, the story was adapted into the comedy film The Alienist. In 2007, it was adapted into a same-titled graphic novella by Fábio Moon and Gabriel Bá (and won the 2008 Prêmio Jabuti for educational material).

Published a year after Machado's first major novel, Memórias Póstumas de Brás Cubas, "The Psychiatrist" follows the scientific efforts of Dr. Simon Bacamarte (Simão Bacamarte in the original – "bacarmarte" being Portuguese for "blunderbuss", an old scattershot gun). Bacamarte, a Brazil-born Portuguese (when Brazil was a colony), is a prominent physician whose sincere obsession for discovering a universal method to cure pathological disorders drives inhabitants of the small Brazilian town of Itaguaí to fear, conspiracy, and revolutionary attempts.

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