Encyclopedias, Almanacs, Transcripts, and Maps
- Jackson, Andrew (1767–1845)
- Jackson, Howell E. (1832–1895)
- Jackson, Robert H. (1892–1954)
- Jacksonianism
- Jacobellis v. Ohio 378 U.S. 184 (1964)
- Jacobs, In Re 98 N.Y. 98 (1885)
- Jacobson v. Massachusetts 197 U.S. 11 (1905)
- Jaish-e-Mohammed (JEM) (Army of Mohammed)
- James v. Bowman 190 U.S. 127 (1903)
- James v. Valtierra 402 U.S. 137 (1971)
- Japan, Intelligence and Security
- Japanese American Cases Hirabayashi v. United States 320 U.S. 81 (1943) Korematsu v. United States 323 U.S. 214 (1944) Ex Parte Endo 323 U.S. 283 (1944)
- Japanese Red Army (JRA)
- Jay's Treaty 8 Stat. 116 (1795)
- Jay, John (1745–1829)
- JDAM (Joint Direct Attack Munition)
- Jefferson, Thomas (1743–1826)
- Jeffersonianism
- Jemaah Islamiya (JI)
- Jencks Act 71 Stat. 595 (1957)