This is a list of all the United States Supreme Court cases from volume 421 of the United States Reports:
| Case name | Citation | Date decided |
|---|---|---|
| Vella v. Ford Motor Co. | 421 U.S. 1 | 1975 |
| Stanton v. Stanton | 421 U.S. 7 | 1975 |
| McLucas v. DeChamplain | 421 U.S. 21 | 1975 |
| Withrow v. Larkin | 421 U.S. 35 | 1975 |
| Train v. Nat. Resources Defense Council, Inc. | 421 U.S. 60 | 1975 |
| Colonial Pipeline Co. v. Traigle | 421 U.S. 100 | 1975 |
| Kugler v. Helfant | 421 U.S. 117 | 1975 |
| NLRB v. Sears, Roebuck & Co. | 421 U.S. 132 | 1975 |
| Renegotiation Bd. v. Grumman Aircraft Eng'g Corp. | 421 U.S. 168 | 1975 |
| Costarelli v. Massachusetts | 421 U.S. 193 | 1975 |
| Gurley v. Rhoden | 421 U.S. 200 | 1975 |
| Johnson v. Mississippi | 421 U.S. 213 | 1975 |
| Alyeska Pipeline Serv. Co. v. Wilderness Soc'y | 421 U.S. 240 | 1975 |
| Hill v. Stone | 421 U.S. 289 | 1975 |
| United States v. Wilson (1975) | 421 U.S. 309 | 1975 |
| Phelps v. United States | 421 U.S. 330 | 1975 |
| Van Lare v. Hurley | 421 U.S. 338 | 1975 |
| Meek v. Pittenger | 421 U.S. 349 | 1975 |
| United States v. Reliable Transfer Co. | 421 U.S. 397 | 1975 |
| Sec. Investor Protection Corp. v. Barbour | 421 U.S. 412 | 1975 |
| Ellis v. Dyson | 421 U.S. 426 | 1975 |
| Johnson v. Ry. Express Agency, Inc. | 421 U.S. 454 | 1975 |
| Dallas Cnty. v. Reese | 421 U.S. 477 | 1975 |
| Pitchess v. Davis | 421 U.S. 482 | 1975 |
| Eastland v. U.S. Servicemen's Fund | 421 U.S. 491 | 1975 |
| Breed v. Jones | 421 U.S. 519 | 1975 |
| Fry v. United States | 421 U.S. 542 | 1975 |
| Dunlop v. Bachowski | 421 U.S. 560 | 1975 |
| United States v. Tax Comm'n | 421 U.S. 599 | 1975 |
| Connell Constr. Co. v. Plumbers | 421 U.S. 616 | 1975 |
| Connor v. Waller | 421 U.S. 656 | 1975 |
| United States v. Park | 421 U.S. 658 | 1975 |
| Mullaney v. Wilbur | 421 U.S. 684 | 1975 |
| Philbrook v. Glodgett | 421 U.S. 707 | 1975 |
| Blue Chip Stamps v. Manor Drug Stores | 421 U.S. 723 | 1975 |
| Edwards v. Healy | 421 U.S. 772 | 1975 |
| Goldfarb v. Va. State Bar | 421 U.S. 773 | 1975 |
| Murphy v. Florida | 421 U.S. 794 | 1975 |
| Bigelow v. Virginia | 421 U.S. 809 | 1975 |
| United Housing Foundation, Inc. v. Forman | 421 U.S. 837 | 1975 |