This is a list of all the United States Supreme Court cases from volume 18:
| Case name | Citation | Decided date |
|---|---|---|
| Houston v. Moore | 18 U.S. 1 | 1820 |
| The United States v. Wiltberger | 18 U.S. 76 | 1820 |
| McClung v. Ross | 18 U.S. 116 | 1820 |
| The Venus Jademerowsky | 18 U.S. 127 | 1820 |
| The London Packet | 18 U.S. 132 | 1820 |
| United States v. Klintock | 18 U.S. 144 | 1820 |
| United States v. Smith | 18 U.S. 153 | 1820 |
| United States v. Furlong Hobson | 18 U.S. 184 | 1820 |
| Stevenson's v. Sullivant | 18 U.S. 207 | 1820 |
| Perkins v. Ramsey | 18 U.S. 269 | 1820 |
| Mandeville v. Welch | 18 U.S. 277 | 1820 |
| Wallace v. Anderson | 18 U.S. 291 | 1820 |
| Polk's Lessee v. Wendell | 18 U.S. 293 | 1820 |
| Marshall v. P R Beverley | 18 U.S. 313 | 1820 |
| Loughborough v. Blake | 18 U.S. 317 | 1820 |
| Mechanics' Bank of Alexandria v. The Bank of Columbia | 18 U.S. 326 | 1820 |
| The Josefa Segunda | 18 U.S. 338 | 1820 |
| Blake v. Doherty | 18 U.S. 359 | 1820 |
| Handly's Lessee v. Anthony | 18 U.S. 374 | 1820 |
| La Amistad de Rues | 18 U.S. 385 | 1820 |
| Lyle v. Rodgers | 18 U.S. 394 | 1820 |
| The United States v. Holmes | 18 U.S. 412 | 1820 |
| Owings v. Speed | 18 U.S. 420 | 1820 |
| Conn v. Penn | 18 U.S. 424 | 1820 |
| Campbell v. Pratt | 18 U.S. 429 | 1820 |
| The Atalanta | 18 U.S. 433 | 1820 |
| United States v. Lancaster | 18 U.S. 434 | 1820 |
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