Certiorari is a procedure through which a court reviews a lower court’s decision or certain other proceedings. In the U.S. Supreme Court, a petition for a writ of certiorari asks the Court to choose a case for review: a grant ordinarily opens that review, while a denial leaves the judgment sought to be reviewed undisturbed without endorsing its reasoning.

A petition is the request; a writ of certiorari is traditionally an order calling for the record of the proceedings to be sent for review. The term is commonly shortened to “cert.” One common U.S. pronunciation is approximately “sur-shee-uh-RAIR-ee.” The key practical question is which court system and review procedure the word describes.

How certiorari works in the U.S. Supreme Court

The ordinary sequence separates selection from deciding the legal question:

1. Identify the decision and review route. A party seeks Supreme Court review of an eligible decision, commonly after proceedings in a federal court of appeals or a state court system.
2. File the petition. The petitioner explains the legal question, the Court’s authority to review it, and why it merits selection. Filing does not itself guarantee review.
3. The Court considers the request. The opposing party may respond under the applicable rules. The Court’s January 2026 Supreme Court 101 booklet explains the Rule of Four: four Justices must vote to grant a petition.
4. Read the disposition carefully. Denial declines the requested review. A grant normally leads to merits briefing and oral argument, but an order can also include a summary disposition.
5. Separate acceptance from the outcome. A merits decision may affirm, reverse, vacate, or remand as appropriate. Acceptance for review is not, by itself, a win for the petitioner.

The Supreme Court Rules effective March 16, 2026 govern the process. Rule 16 distinguishes the disposition of a petition from ordinary merits proceedings and permits summary disposition. It also explains that a formal writ does not issue unless specially directed; the Court normally enters and communicates an order granting review.

Why is Supreme Court certiorari discretionary?

The Court selects cases rather than providing every losing litigant with another appeal. Rule 10 states that certiorari review is discretionary and requires compelling reasons.

Examples include a conflict between federal appellate courts on the same important issue, conflicting decisions involving important federal questions, or an important federal question that the Supreme Court should resolve. The rule also addresses departures from the usual course of judicial proceedings that call for the Court’s supervisory role.

These considerations are neither exhaustive nor a guarantee. Rule 10 specifically says that claimed errors in factual findings, or misapplication of a correctly stated legal rule, rarely justify a grant. “The lower court got my case wrong” and “courts need a uniform answer to this important federal question” are different arguments for selection.

Which decisions can the Supreme Court review?

28 U.S.C. section 1254 authorizes certiorari review of cases in the federal courts of appeals on a party’s petition, before or after judgment. Review before an appellate judgment is exceptional: Rule 11 requires imperative public importance justifying departure from normal appellate practice.

For state cases, section 1257 addresses final judgments of the highest state court in which a decision could be had, involving the specified federal issues. A dispute being in state court does not prevent Supreme Court review, but a purely state-law disagreement does not become a federal question simply because a party seeks certiorari.

These statutory routes concern review by the U.S. Supreme Court. They are different from a state court reviewing a local tribunal through its own certiorari procedure.

Certiorari compared with an appeal and certification

The federal judiciary’s Appeals guide explains the ordinary appeal/certiorari distinction. A court’s appellate jurisdiction and a litigant’s ability to invoke a particular review route should not be confused with entitlement to discretionary selection.

What does denial of certiorari mean?

For the litigant, the judgment whose review was requested remains undisturbed by that denial. For other readers, the denial is not an affirmance of the lower court’s reasoning, a ruling on the merits, or adoption of that decision as Supreme Court precedent.

In his opinion respecting denial in Maryland v. Baltimore Radio Show, 338 U.S. 912 (1950), Justice Frankfurter explained why different considerations can lead to denial and why it implies no approval or disapproval of the lower court’s decision. This was an explanation respecting denial, not a Supreme Court merits decision resolving the underlying dispute.

Misconception: “Cert. denied means the Supreme Court agreed.” It means the requested review was not granted. Any precedential force of the lower decision comes from that decision and the rules governing its use, not from treating denial as a Supreme Court holding. The order also does not tell readers how the Justices would have voted on the merits.

What should be checked after a grant or denial?

Read the actual order: a grant with a summary vacatur or remand is different from a grant setting a case for ordinary merits review. A dismissal is also a distinct disposition and should not casually be relabeled denial or affirmance.

Timing requires the current rules and procedural record. Rule 13 addresses the judgment or relevant rehearing event for petition timing, rather than simply the lower court’s mandate date. Rehearing of a Supreme Court denial is limited by Rule 44.2 to specified substantial grounds; it is not a routine opportunity to repeat the petition. Under Rule 16.3, the denial order is not suspended merely because rehearing is sought, absent an order of the Court or a Justice.

Check any applicable stay, mandate, or enforcement arrangements separately. Do not assume a request for further review automatically puts the underlying judgment on hold or preserves every other deadline.

Does certiorari mean the same thing in state court?

No. State law may use certiorari for a distinct form of judicial review, including proceedings involving a public body, rather than the Supreme Court’s case-selection process.

For example, Massachusetts General Laws chapter 249, section 4 authorizes a civil action in the nature of certiorari to correct errors in certain proceedings not otherwise reviewable by motion or appeal. The statute identifies the available courts and allows relief including quashing or affirming the proceedings. That is a local statutory mechanism with its own requirements, not a nationwide formula or the Supreme Court’s Rule of Four.

The jurisdiction label matters: “state certiorari” may describe a state procedure, while Supreme Court certiorari may seek review of a state-court judgment on a federal issue.

Federal and state examples

An actual federal case: In Ashcroft v. Iqbal, the Supreme Court reviewed a Second Circuit decision through certiorari and, in its 2009 merits decision, reversed and remanded. The official opinion, 556 U.S. 662, illustrates separate procedural events: obtaining Supreme Court review and then receiving a merits disposition. A different petition could be denied or produce a different outcome.

A hypothetical state proceeding: A person challenges an error in a Massachusetts local body’s qualifying proceedings for which ordinary review by motion or appeal is unavailable. Chapter 249, section 4 may supply an action in the nature of certiorari if its requirements are met. The state court then applies that procedure’s grounds and available relief. The example does not establish that every board decision qualifies, or that another state offers the same route.

Use three questions to orient a reference to certiorari: Which court is being asked? What decision or proceeding is involved? What does the actual order do? Those questions prevent an ordinary appeal, Supreme Court petition, and local review action from being treated as interchangeable.

Frequently asked questions

Is certiorari an automatic appeal?

U.S. Supreme Court certiorari is discretionary. Ordinary appeal rights and state certiorari procedures depend on their governing law.

Does a grant mean the petitioner wins?

A grant alone means review is accepted. Read whether the order also contains a summary merits disposition; otherwise, the merits remain to be decided.

Does denial approve the lower court’s reasoning?

No. Supreme Court denial leaves the judgment sought to be reviewed undisturbed without making its reasoning a Supreme Court holding.

This is general legal information. The governing court’s current rules and a qualified lawyer can clarify the procedure for an actual case.