Based on the original edition first published in 1934, Judaism as a Civilization: Toward a Reconstruction of American-Jewish Life is a work on Judaism and American Jewish life by Rabbi Mordecai M. Kaplan, the founder of Reconstructionist Judaism.
The book is Kaplan's most notable work and has influenced a number of American Jewish thinkers. Kaplan's work centers around the concept that Judaism ought not to be defined as the religion of the Jews, but the sum of Jewish religion, culture, language, literature and social organization.