- Lawrence v. Texas (Majority & Concurrence) (Ft. Justice Anthony Kennedy)
- Lochner v. New York (Ft. Rufus Peckham)
- Lonchar v. Thomas (Ft. Justice Stephen Breyer)
- Loretto v. Teleprompter Manhattan CATV Corp
- Louisville & Nashville RR v. Mottley (Ft. William Henry Moody)
- Lucas v. South Carolina Coastal Council (Ft. Antonin Scalia)
- Mac's Shell Service, Inc. v. Shell Oil Products Co. LLC (Ft. Justice Samuel Alito)
- Maine v. Taylor (Ft. Justice Harry Blackmun)
- Marsh v. Alabama (Ft. Hugo Black)
- Martin v. Hunter's Lessee (Ft. Joseph Story)
- Maryland v. Buie (Ft. White (BRA))
- Mathews v. Eldridge (Ft. Lewis F. Powell)
- McCLESKEY v. ZANT
- McCullen v. Coakley (Ft. Chief Justice John Roberts)
- McCulloch v. Maryland, 1819
- McCutcheon v. FEC: Oral Arguments 10/8/13 (No. 12-536)
- McCutcheon v. Federal Election Commission (Ft. Chief Justice John Roberts)
- McGee v. International Life Insurance Co. (Ft. Hugo Black)
- Miller v. California (Ft. Chief Justice Burger)
- Missouri v. Jenkins (Ft. P. 103)