Major works:
* "History of Romanian Literature" (Istoria literaturii române): This multi-volume work is considered a cornerstone of Romanian literary studies. It provides a comprehensive overview of Romanian literature from its origins to the 20th century.
* "The Last Century of Romanian Literature" (Ultimul veac al literaturii române): A critical analysis of Romanian literature in the 19th and 20th centuries.
* "The Romanian Novel" (Romanul românesc): An extensive study of the development of the Romanian novel, focusing on key authors and themes.
* "The Romanian Short Story" (Povestirea românească): A similar study dedicated to the evolution of the Romanian short story genre.
* "The Romanian Theatre" (Teatrul românesc): An exploration of the history and major figures of Romanian theater.
* "The Romanian Ballad" (Balada românească): A detailed analysis of the Romanian ballad tradition.
Other notable works:
* "The Image of Man in Romanian Literature" (Chipul omului în literatura română)
* "The Romanian Cultural Landscape" (Peisajul cultural românesc)
* "The History of the Romanian Language" (Istoria limbii române)
* "Essays on Romanian Literature" (Eseuri de literatură română)
Petru Comarnescu's works are characterized by their in-depth analysis, sharp critical insight, and comprehensive historical perspective. He is considered one of the most important and influential literary critics in Romania. His writings continue to be studied and referenced by scholars and enthusiasts of Romanian literature.