Ex parte Siebold

{{Use mdy dates|date=September 2023}}

{{Infobox SCOTUS case

|Litigants=Ex parte Siebold

|ArgueDate=

|ArgueYear=

|DecideDate=October 1

|DecideYear=1879

|FullName=

|USVol=100

|USPage=371

|ParallelCitations=

|Prior=

|Subsequent=

|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, § 2, cl. 2

}}

Ex parte Siebold, 100 U.S. 371 (1879), was a decision of the United States Supreme Court concerning the separation of powers and the Appointments Clause.