This is a list of all the United States Supreme Court cases from volume 256 of the United States Reports:
| Case name | Citation | Date decided |
|---|---|---|
| Chase v. United States | 256 U.S. 1 | 1921 |
| Gilpin v. United States | 256 U.S. 10 | 1921 |
| United States v. Smith (1921) | 256 U.S. 11 | 1921 |
| Silver King Coalition Mines Co. v. Conkling Mining Co. | 256 U.S. 18 | 1921 |
| Arkansas v. Mississippi | 256 U.S. 28 | 1921 |
| Baldwin Co. v. R. S. Howard Co. | 256 U.S. 35 | 1921 |
| American Steel Foundries v. Whitehead | 256 U.S. 40 | 1921 |
| Minnesota ex rel. Whipple v. Martinson | 256 U.S. 41 | 1921 |
| Galbraith v. Vallely | 256 U.S. 46 | 1921 |
| United States v. Northern Pacific R. Co. | 256 U.S. 51 | 1921 |
| Oklahoma v. Texas | 256 U.S. 70 | 1921 |
| Ownbey v. Morgan | 256 U.S. 94 | 1921 |
| Economy Light & Power Co. v. United States | 256 U.S. 113 | 1921 |
| Wall v. Chesapeake & Ohio R. Co. | 256 U.S. 125 | 1921 |
| Bank of Minden v. Clement | 256 U.S. 126 | 1921 |
| Miller & Lux, Inc. v. Sacramento & San Joaquin Drainage Dist. | 256 U.S. 129 | 1921 |
| Ex parte National Park Bank of N. Y. | 256 U.S. 131 | 1921 |
| Missouri Pacific R. Co. v. McGrew Coal Co. | 256 U.S. 134 | 1921 |
| Block v. Hirsh | 256 U.S. 135 | 1921 |
| Marcus Brown Holding Co. v. Feldman | 256 U.S. 170 | 1921 |
| Privett v. United States | 256 U.S. 201 | 1921 |
| Atchison, T. & S. F. R. Co. v. United States | 256 U.S. 205 | 1921 |
| Frey & Son, Inc. v. Cudahy Packing Co. | 256 U.S. 208 | 1921 |
| North Dakota v. Minnesota | 256 U.S. 220 | 1921 |
| Nickel v. Cole | 256 U.S. 222 | 1921 |
| St. Louis-San Francisco R. Co. v. Middlekamp | 256 U.S. 226 | 1921 |
| Newberry v. United States | 256 U.S. 232 | 1921 |
| New York v. New Jersey | 256 U.S. 296 | 1921 |
| St. Louis & East St. Louis Electric R. Co. v. Missouri ex rel. Hagerman | 256 U.S. 314 | 1921 |
| Blanset v. Cardin | 256 U.S. 319 | 1921 |
| Philadelphia & Reading R. Co. v. Di Donato | 256 U.S. 327 | 1921 |
| Philadelphia & Reading R. Co. v. Polk | 256 U.S. 332 | 1921 |
| Brown v. United States (1921) | 256 U.S. 335 | 1921 |
| New York Trust Co. v. Eisner | 256 U.S. 345 | 1921 |
| American Bank & Trust Co. v. Federal Reserve Bank of Atlanta | 256 U.S. 350 | 1921 |
| Heitmuller v. Stokes | 256 U.S. 359 | 1921 |
| Krichman v. United States | 256 U.S. 363 | 1921 |
| Dillon v. Gloss | 256 U.S. 368 | 1921 |
| LaBelle Iron Works v. United States | 256 U.S. 377 | 1921 |
| Frederick v. Fidelity Mut. Life Ins. Co. of Philadelphia | 256 U.S. 395 | 1921 |
| Yee Won v. White | 256 U.S. 399 | 1921 |
| United States v. Aetna Explosives Co. | 256 U.S. 402 | 1921 |
| New York Central & Hudson River R. Co. v. York & Whitney Co. | 256 U.S. 406 | 1921 |
| Vicksburg, S. & P. R. Co. v. Anderson-Tully Co. | 256 U.S. 408 | 1921 |
| Ex parte Matthew Addy S. S. & Commerce Corp. | 256 U.S. 417 | 1921 |
| Bethlehem Motors Corp. v. Flynt | 256 U.S. 421 | 1921 |
| Michigan Central R. Co. v. Mark Owen & Co. | 256 U.S. 427 | 1921 |
| Heirs of Garland v. Choctaw Nation | 256 U.S. 439 | 1921 |
| United States v. American Chicle Co. | 256 U.S. 446 | 1921 |
| United States v. Yuginovich | 256 U.S. 450 | 1921 |
| Burdeau v. McDowell | 256 U.S. 465 | 1921 |
| McLaren v. Fleischer | 256 U.S. 477 | 1921 |
| Culpepper v. Ocheltree | 256 U.S. 483 | 1921 |
| United States v. Bowling | 256 U.S. 484 | 1921 |
| Ex parte New York | 256 U.S. 490 | 1921 |
| Ex parte New York | 256 U.S. 503 | 1921 |
| Ex parte Lincoln Gas & Elec. Light Co. | 256 U.S. 512 | 1921 |
| Anchor Oil Co. v. Gray | 256 U.S. 519 | 1921 |
| United States v. Hutto | 256 U.S. 524 | 1921 |
| United States v. Hutto | 256 U.S. 530 | 1921 |
| Choctaw, O. & G. R. Co. v. Mackey | 256 U.S. 531 | 1921 |
| Yazoo & Mississippi Valley R. Co. v. Nichols & Co. | 256 U.S. 540 | 1921 |
| United States v. Pfitsch | 256 U.S. 547 | 1921 |
| Missouri Pacific R. Co. v. Ault | 256 U.S. 554 | 1921 |
| Norfolk-Southern R. Co. v. Owens | 256 U.S. 565 | 1921 |
| Western Union Telegraph Co. v. Esteve Brothers & Co. | 256 U.S. 566 | 1921 |
| Sutton v. United States | 256 U.S. 575 | 1921 |
| District of Columbia v. R. P. Andrews Paper Co. | 256 U.S. 582 | 1921 |
| Dane v. Jackson | 256 U.S. 589 | 1921 |
| Oklahoma v. Texas | 256 U.S. 602 | 1921 |
| Missouri, K. & T. R. Co. v. United States | 256 U.S. 610 | 1921 |
| Ex parte Hussein Lutfi Bey | 256 U.S. 616 | 1921 |
| Texas Co. v. Hogarth Shipping Co. | 256 U.S. 619 | 1921 |
| United States v. Woodward | 256 U.S. 632 | 1921 |
| Merchants' Nat. Bank of Richmond v. Richmond | 256 U.S. 635 | 1921 |
| Bowman v. Continental Oil Co. | 256 U.S. 642 | 1921 |
| Harris v. District of Columbia | 256 U.S. 650 | 1921 |
| Seaboard Air Line R. Co. v. United States | 256 U.S. 655 | 1921 |
| Kansas City Southern R. Co. v. Road Improvement Dist. No. 6 of Little River Cty. | 256 U.S. 658 | 1921 |
| Western Union Telegraph Co. v. Poston | 256 U.S. 662 | 1921 |
| Weber Elec. Co. v. E. H. Freeman Elec. Co. | 256 U.S. 668 | 1921 |