- Labor and Labor Practices
- Ladue v. Gilleo
- Lambert v. Blackwell
- Lamb's Chapel v. Center Moriches Union Free School District
- Lamont v. Postmaster General of the United States
- Lassiter v. Department of Social Services
- Lebron v. National Railroad Passenger Corporation
- Lechmere, Inc. v. NLRB
- Lee v. Washington
- Lee v. Weisman
- Legislative Powers
- Leisy v. Hardin
- Lemon v. Kurtzman
- Levy v. Louisiana
- Libel
- Linkletter v. Walker
- Lochner v. New York
- Lockett v. Ohio
- Lockhart v. McCree
- Loewe v. Lawlor
- Louisiana ex rel. Francis v. Resweber
- Lovell v. City of Griffin
- Loving v. Commonwealth of Virginia
- Lucas v. South Carolina Coastal Council
- Luther v. Borden
- Lynch v. Donnelly
- Lyng v. Northwest Indian Cemetery Protection Association
