Petru Comarnescu (born 23 November 1905, Iași- d. 27 November 1970, Bucharest) was a Romanian literary and art critic and translator.
Born in Iași into a family that was related to the metropolitan bishop Veniamin Costache, he studied at the University of Bucharest law (degree in 1928), philosophy and philology (degree in 1929) before going in 1931 on a two-year scholarship to the United States of America, where he received a PhD in aesthetics from the University of Southern California, Los Angeles, with a thesis entitled The Nature of Beauty and Its Relation to Goodness (published later in Romanian in 1946 as Kalokagathon).
Together with Mircea Vulcănescu and Alexandru Christian Tell, he started the Criterion association and magazine in 1934.
Before the Second World War he published in several Romanian newspapers, for example Adevărul, Adevărul literar și artistic, Azi, Stânga, Arta, Excelsior, Da și nu, Ulisse and was an editor at Vremea (1931–1936), Rampa (1933–1934), Revista Fundațiilor Regale (from its foundation to 1943). Between 1944 and 1949 he published in Bis, Agora, Timpul, Arcades, Națiunea, Universul.
Between 1949 and 1960 he was not allowed to publish under his own name, due to political reasons. The only exceptions were monographies about painters or sculptors: Octav Băncilă (1954), Abgar Baltazar (1956), Viaţa şi opera lui Rembrandt van Rijn ("The Life And Work of Rembrandt")(1957), Nicolae Grigorescu (1959), Ştefan Luchian (1960).
Later, he would also write about other well-known Romanian visual artists, such as Gheorghe Petrașcu, Theodor Pallady, Nicolae Tonitza, Francisc Șirato, Ion Țuculescu, sometimes even in English The Romanian and the Universal in Brâncuși's Work (1970).