The Supreme Court of Sri Lanka is the highest court in Sri Lanka and the final judicial instance of record. Established in 1801 and empowered to exercise its powers subject to the provisions of the Constitution of Sri Lanka, the Supreme Court has ultimate appellate jurisdiction in constitutional matters and takes precedence over all lower courts. The Sri Lankan judicial system is a complex blend of common law and civil law. In some cases, such as those involving capital punishment, the decision may be passed on to the President of Sri Lanka for clemency petitions. The current Chief Justice of Sri Lanka is Jayantha Jayasuriya.

In most legal jurisdictions, a supreme court, also known as a court of last resort, apex court, and high court of appeal, is the highest court within the hierarchy of courts. Broadly speaking, the decisions of a supreme court are binding on all other courts in a nation and are not subject to further review by any other court. Supreme courts typically function primarily as appellate courts, hearing appeals from decisions of lower trial courts, or from intermediate-level appellate courts. A Supreme Court can also, in certain circumstances, act as a court of original jurisdiction, however, this is typically limited to constitutional law.