James Marshall Unger, (born May 28, 1947 in Cleveland, Ohio), is a professor of Japanese at Ohio State University who specializes in historical linguistics and the writing systems of East Asia.
- Studies in Early Japanese Morphophonemics (Bloomington: Indiana University Linguistics Club, 1977; 2nd ed. 1993)
- With F. C. Lorish, M. Noda, Y. Wada A Framework for Introductory Japanese Language Curricula in American High Schools and Colleges (Washington, D.C.: National Foreign Language Center, 1993)
- The Fifth Generation Fallacy (New York: Oxford University Press, 1987)
- Literacy and Script Reform in Occupation Japan (New York: Oxford University Press, 1996)
- Ideogram: Chinese Characters and the Myth of Disembodied Meaning (Honolulu: University of Hawai'i Press, 2004)
- The Role of Contact in the Origins of the Japanese and Korean Languages (Honolulu: University of Hawai'i Press, 2009)