| Litigants: | Ex parte Siebold |
| Decidedate: | October 1 |
| Decideyear: | 1879 |
| Usvol: | 100 |
| Uspage: | 371 |
| Holding: | So long as the vesting is consistent with the separation of powers, Congress has discretion to vest the appointment of an inferior officer in the President, a Department Head, or a Court of Law. |
| Majority: | Bradley |
| Joinmajority: | Waite, Swayne, Miller, Strong, Hunt, and Harlan |
| Dissent: | Field |
| Joindissent: | Clifford |
| Lawsapplied: | U.S. Const. art. II, ยง 2, cl. 2 |
Ex parte Siebold, 100 U.S. 371 (1879), was a decision of the United States Supreme Court concerning the Appointments Clause.