Can the US Supreme Court only hear appeals from the federal Circuit courts?

No, but that is where the majority of the Supreme Court's appellate cases originate They can also hear certain cases directly on appeal from federal District Court. For example, the case of the United States v. Nixon (1973) went directly from District Court to the high court, as did any case related to the Flag Protection Act of 1989 (because Congress wrote a provision into the bill bypassing the Circuit court) The Supreme Court can also review cases from state supreme courts, provided the case involves a question of federal or constitutional law For more information on the federal court system, see Related Questions, below.

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