Encyclopedias, Almanacs, Transcripts, and Maps
- Jury Size
- Jury Unanimity
- Jury Unanimity (Update)
- Jus Dare
- Jus Dicere
- Just Compensation
- Justice Department, United States
- Justiciability
- Juvenile Curfew Laws
- Juvenile Proceedings
- Kahane Chai (Kach)
- Kahane, Meir
- Kalven, Harry, Jr. (1914–1974)
- Kansas-Nebraska Act 10 Stat 277 (1854)
- Kastigar v. United States 406 U.S. 441 (1972)
- Katz v. United States 389 U.S. 347 (1967)
- Katzenbach v. Morgan 384 U.S. 641 (1966)
- Keating-Owen Child Labor Act 39 Stat. 675 (1916)
- Kelly, Alfred H. (1907–1976)
- Kemmler, In Re 136 U.S. 436 (1890) Mcelvaine v. Brush 142 U.S. 155 (1891) O'Neil v. Vermont 144 U.S. 155 (1892)