Comparative literature (sometimes abbreviated "Comp. lit.") is critical scholarship dealing with the literature of two or more different linguistic, cultural or national groups. While most frequently practiced with works of different languages, it may also be performed on works of the same language if the works originate from different nations or cultures among which that language is spoken. Also included in the range of inquiry are comparisons of different types of art; for example, a comparatist might investigate the relationship of film to literature.
Students and instructors in the field, usually called "comparatists," have traditionally been proficient in several languages and acquainted with the literary traditions and major literary texts of those languages. Some of the newer sub-fields, however, stress theoretical acumen and the ability to consider different types of art concurrently, over high linguistic competence.

The interdisciplinary nature of the field means that comparatists typically exhibit some acquaintance with translation studies, sociology, critical theory, cultural studies, religious studies, and history. As a result, comparative literature programs within universities may be designed by scholars drawn from several such departments. This eclecticism has led critics (from within and without) to charge that Comparative Literature is insufficiently well-defined, or that comparatists too easily fall into dilettantism, because the scope of their work is, of necessity, broad. Some question whether this breadth affects the ability of Ph.D.s to find employment in the highly specialized environment of academia and the career market at large, although such concerns do not seem to be borne out by placement data that shows comparative literature graduates to be hired at similar or higher rates than their compeers in English.

The terms "Comparative Literature" and "World Literature" are often used to designate a similar course of study and scholarship. Comparative Literature is the more widely used term in the United States, with many universities having Comparative Literature departments or Comparative Literature programs.

Comparative literature is an interdisciplinary field whose practinioners study literature across national borders, across time periods, across languages, across genres, across boundaries between literature and the other arts (music, painting, dance, film, etc.), across disciplines (literature and psychology, philosophy, science, history, architecture, sociology, politics, etc.). Defined most broadly, comparative literature is the study of "literature without borders." Scholarship in Comparative Literature include, for example, studying literacy and social status in the Americas, studying medieval epic and romance, studying the links of literature to folklore and mythology, studying colonial and postcolonial writings in different parts of the world, asking fundamental questions about definitions of literature itself. What scholars in Comparative Literature share is a desire to study literature beyond national boundaries and an interest in languages so that they can read foreign texts in their original form. Many comparatists also share the desire to integrate literary experience with other cultural phenomena such as historical change, philosophical concepts, and social movements.

The discipline of Comparative Literature has scholarly associations such as the ICLA: International Comparative Literature Association and comparative literature associations exists in many countries: for a list of such see BCLA: British Comparative Literature Association; for the US, see ACLA: American Comparative Literature Association. There are many learned journals that publish scholarship in Comparative Literature: see "Selected Comparative Literature and Comparative Humanities Journals" and for a list of books in Comparative Literature see "A Selected Shortlist of Comparative Literature (Text)Books in English, French, and German".