- Kahn v. Shevin
- Kansas v. Hendricks
- Karcher v. Daggett
- Kass v. Kass
- Kastigar v. United States
- Katz v. United States
- Katzenbach v. McClung
- Katzenbach v. Morgan
- Kendall v. United States
- Kent v. Dulles
- Kent v. United States
- Kentucky v. Dennison
- Keyes v. School District No. 1
- Keyishian v. Board of Regents of the University of the State of New York
- Kilbourn v. Thompson
- King v. Smith
- Kingsley v. Kingsley
- Kirkpatrick v. Preisler
- Kolender v. Lawson
- Korematsu v. United States
