Jeffrey Kaplan (born 1954) is an American academic who has written and edited a number of books on racism, religious violence, terrorism and the far-right. He is an associate professor of religion at the University of Wisconsin–Oshkosh and a member of the board of academic advisors of the university's Institute for the Study of Religion, Violence and Memory.^[1]

Kaplan sits on the editorial boards of the journals Terrorism and Political Violence, Nova Religio and The Pomegranate.^[1]

Kaplan earned an M.A. in Linguistics from Colorado State University in 1981, a M.A. in international relations from The Fletcher School of Law and Diplomacy in 1989, and earned a Ph.D. in the history of culture from the University of Chicago in 1993.^[2] His thesis was titled "Revolutionary Millenarianism in the Modern World: From Christian Identity to Gush Emunim".^[3]

Kaplan was an associate professor of history at Iḷisaġvik College in Utqiagvik, Alaska.^[4]

Kaplan was awarded a Guggenheim Foundation Research Grant for a project on "The Emergence of a Violent Euro-American Radical Right" with Leonard Weinberg.^[5] Kaplan occupied the Bicentennial Fulbright Chair in American Studies at the University of Helsinki in Finland from 1998 to 1999.^[6]

• Radical Religion in America: Millenarian Movements From the Far Right to the Children of Noah (1997). Published by Syracuse University Press as a 245-page hardcover (ISBN 0815626878) and paperback (ISBN 0815603967).
• Nation and Race: The Developing Euro-American Racist Subculture (1998; co-edited with Tore Bjørgo). Published in Boston by Northeastern University Press as a 273-page hardcover (ISBN 1555533329) and paperback (ISBN 1555533310).
• The Emergence of a Euro-American Radical Right (1998; co-authored with Leonard Weinberg). Published in New Brunswick, New Jersey, by Rutgers University Press as a 238-page hardcover (ISBN 0813525632) and paperback (ISBN 0813525640).
• Beyond the Mainstream: The Emergence of Religious Pluralism in Finland, Estonia, and Russia (2000). Published in Helsinki by SKS as a 386-page hardcover? (ISBN 9517461801).
• Encyclopedia of White Power: A Sourcebook on the Radical Racist Right (2000). Published in Walnut Creek, California, by Altamira Press as a 585-page hardcover in 2000 (ISBN 0742503402).
• The Cultic Milieu: Oppositional Subcultures in an Age of Globalization (2002; co-edited with Heléne Lööw [sv]). Published in Walnut Creek, California, by AltaMira Press as a 353-page hardcover (ISBN 0759102031) and paperback (ISBN 075910204X).
• Millennial Violence: Past, Present and Future (2002; as editor). Originally appearing as a special issue of Terrorism and Political Violence (Vol. 14, No. 1; Spring 2002), it was published in London and Portland, Oregon by F. Cass as a 318-page hardcover (ISBN 0714652946) and paperback (ISBN 0714682594).
• The Encyclopedia of Religion and Nature (2005; consulting editor, with editor-in-chief Bron Taylor). Published in London and New York by Thoemmes Continuum in 2 volumes, totaling 1877 pages, in hardcover (ISBN 1843711389). It was published in paperback in 2008 (ISBN 1847062733)
• Terrorist Groups and the New Tribalism: Terrorism's Fifth Wave (2010). Published in Abingdon, Oxon, and New York by Routledge as a 235-page hardcover (ISBN 0415453380) and e-book (ISBN 0203857526).
• Radical Religion and Violence: Theory and Case Studies Published in New York by Routledge as a 496-page hardcover (ISBN 0415814146)