Opinion of REHNQUIST, J. 437 U.S. court persistently and without reason refuses to adjudicate a case properly before it, the court of appeals may issue the writ "in order that [it] may exercise the jurisdiction of review given by law." Insurance Co. v. Comstock, 16 Wall. 258, 270 (1873). "Otherwise the appellate jurisdiction could be defeated and the purpose of the statute authorizing the writ thwarted by unauthorized action of the district court obstructing the appeal." Roche, supra, at 25.5 To say that a court of appeals has the power to direct a district court to proceed to judgment in a pending case "when it is its duty to do so," 319 U. S., at 26, states the standard but does not decide this or any other particular case. It is essential that the moving party satisfy "the burden of showing that its right to issuance of the writ is 'clear and indisputable.'" Bankers Life & Cas. Co., supra, at 384, quoting United States v. Duell, 172 U. S. 576, 582 (1899). Judge Will urges that Calvert does not have a "clear and indisputable" right to the adjudication of its claims in the District Court without regard to the concurrent state proceedings. To that issue we now must turn. III It is well established that "the pendency of an action in the state court is no bar to proceedings concerning the same matter in the Federal court having jurisdiction." McClellan v. Carland, 217 U. S. 268, 282 (1910). It is equally well settled that a district court is "under no compulsion to exercise that jurisdiction," Brillhart v. Excess Ins. Co., 316 U. S. 491, 5 A classic example of the proper issuance of the writ to protect eventual appellate jurisdiction is Thermtron Products, Inc. v. Hermansdorfer, 423 U. S. 336 (1976), in which a case had been remanded to the state courts on grounds utterly unauthorized by the controlling statute. The dissenters in that case urged that Congress had intended to bar all review of remand orders, not that mandamus would have been inappropriate absent such a bar. Id., at 354 (REHNQUIST, J., joined by BURGER, C. J., and STEWART, J., dissenting). 655 Opinion of REHNQUIST, J. 494 (1942), where the controversy may be settled more expeditiously in the state court. Although most of our decisions discussing the propriety of stays or dismissals of duplicative actions have concerned conflicts of jurisdiction between two federal district courts, e. g., Kerotest Mfg. Co., v. C-O-Two Fire Equipment Co., 342 U. S. 180 (1952); Landis v. North American Co., 299 U. S. 248 (1936), we have recognized the relevance of those cases in the analogous circumstances presented here. See Colorado River, 424 U. S., at 817-819. In both situations, the decision is largely committed to the "carefully considered judgment," id., at 818, of the district court. This power has not always been so clear. In McClellan, on facts similar to those presented here, this Court indicated that the writ might properly issue where the District Court had stayed its proceedings in deference to concurrent state proceedings. Such an automatic exercise of authority may well have been appropriate in a day when Congress had authorized fewer claims for relief in the federal courts, so that duplicative litigation and the concomitant tension between state and federal courts could rarely result. However, as the overlap between state claims and federal claims increased, this Court soon recognized that situations would often arise when it would be appropriate to defer to the state courts. "Ordinarily it would be uneconomical as well as vexatious for a federal court to proceed in a declaratory judgment suit where another suit is pending in a state court presenting the same issues, not governed by federal law, This Court there held, not that the writ should issue, but that the Court of Appeals should have required the District Judge to show cause why the writ should not issue. Judge Carland presented an affidavit to this Court attempting to defend his stay order on the basis of substantially completed state proceedings. As that affidavit was not in the record before the Court of Appeals, this Court did not "pass upon the sufficiency of those proceedings to authorize the orders in question," 217 U. S., at 283, but directed the Court of Appeals to do so in the first instance. Opinion of REHNQUIST, J. 437 U.S. between the same parties. Gratuitous interference with the orderly and comprehensive disposition of a state court litigation should be avoided." Brillhart, supra, at 495. The decision in such circumstances is largely committed to the discretion of the district court. 316 U. S., at 494. Furthermore, Colorado River, supra, at 820, established that such deference may be equally appropriate even when matters of substantive federal law are involved in the case. It is true that Colorado River emphasized "the virtually unflagging obligation of the federal courts to exercise the jurisdiction given them." 424 U. S., at 817. That language underscores our conviction that a district court should exercise its discretion with this factor in mind, but it in no way undermines the conclusion of Brillhart that the decision whether to defer to the concurrent jurisdiction of a state court is, in the last analysis, a matter committed to the district court's discretion. Seizing upon the phrase "unflagging obligation" in an opinion which upheld the correctness of a district court's final decision to dismiss because of concurrent jurisdiction does little to bolster a claim for the extraordinary writ of mandamus in a case such as this where the District Court has rendered no final decision. We think it of considerably more importance than did the Court of Appeals that Colorado River came before the Court of Appeals on appeal pursuant to 28 U. S. C. § 1291 following outright dismissal of the action by the District Court, rather than through an effort on the part of the federal-court plaintiff to seek mandamus. Calvert contends here, and the Court of Appeals for the Seventh Circuit agreed, that Judge Will's order deferring the federal proceedings was "equivalent to a dismissal." 560 F. 2d, at 796. We are loath to rest our analysis on this ubiquitous phrase, for if used carelessly or without a precise definition it may impede rather than assist sound resolution of the underlying legal issue. 655 Opinion of REHNQUIST, J. Obviously, if Judge Will had dismissed Calvert's action Calvert could have appealed the order of dismissal to the Court of Appeals, which could have required such action of Judge Will "as may be just under the circumstances." 28 U. S. C. § 2106. Since he did not dismiss the action, Calvert remained free to urge reconsideration of his decision to defer based on new information as to the progress of the state case; to this extent, at least, deferral was not "equivalent to a dismissal." There are sound reasons for our reiteration of the rule that a district court's decision to defer proceedings because of concurrent state litigation is generally committed to the discretion of that court. No one can seriously contend that a busy federal trial judge, confronted both with competing demands on his time for matters properly within his jurisdiction and with inevitable scheduling difficulties because of the unavailability of lawyers, parties, and witnesses, is not entrusted with a wide latitude in setting his own calendar. Had Judge Will simply decided on his own initiative to defer setting this case for trial until the state proceedings were completed, his action would have been the "equivalent" of granting the motion of American Mutual to defer, yet such action would at best have afforded Calvert a highly dubious claim for mandamus. We think the fact that the judge accomplished this same result by ruling favorably on a party's motion to defer does not change the underlying legal question. Although the District Court's exercise of its discretion may be subject to review and modification in a proper interlocutory appeal, cf. Landis, 299 U. S., at 256-259, we are convinced that it ought not to be overridden by a writ of mandamus.' Where 7 Although in at least one instance we approved the issuance of the writ upon a mere showing of abuse of discretion, La Buy v. Howes Leather Co., 352 U. S. 249, 257 (1957), we warned soon thereafter against the dangers "Courts faced with petitions for the peremptory writs must be careful lest they suffer themselves to be misled by labels such as 'abuse of discretion' and 'want of power' into interlocutory review of non of such a practice. Opinion of REHNQUIST, J. 437 U.S. a matter is committed to the discretion of a district court, it cannot be said that a litigant's right to a particular result is "clear and indisputable." " Calvert contends that a district court is without power to stay proceedings, in deference to a contemporaneous state action, where the federal courts have exclusive jurisdiction over the issue presented. Whether or not this is so, petitioner has not purported to stay consideration of Calvert's claim for damages under the Securities Exchange Act of 1934, which is the only issue which may not be concurrently resolved by both courts. It is true that petitioner has not yet ruled upon this claim. Where a district court obstinately refuses to adjudicate a matter properly before it, a court of appeals may issue the writ to correct "unauthorized action of the district appealable orders on the mere ground that they may be erroneous." Will v. United States, 389 U. S. 90, 98 n. 6 (1967). Beacon Theatres, Inc. v. Westover, 359 U. S. 500 (1959), is not to the contrary. Both the Court and the dissenters agreed that mandamus should issue to protect a clear right to a jury trial. Id., at 511; ibid. (STEWART, J., dissenting). The Court simply concluded that it was "not permissible," id., at 508, for the District Court to postpone a jury trial until after most of the relevant issues had been settled in an equitable action before the court. Here, we have repeatedly recognized that it is permissible for a district court to defer to the concurrent jurisdiction of a state court. That a litigant's right to proceed with a duplicative action in a federal court can never be said to be "clear and indisputable" is made all the more apparent by our holding earlier this Term in General Atomic Co. v. Felter, 434 U. S. 12 (1977), that a state court lacks the power to restrain vexatious litigation in the federal courts. There, we reaffirmed the principle that "[f]ederal courts are fully capable of preventing their misuse for purposes of harassment." Id., at 19. • The only other issue encompassed by the writ was Calvert's Rule 10b-5 claim for equitable relief. It is not disputed here that the state court has jurisdiction to rescind the agreement as Calvert requests. That being conceded, we find no merit in Calvert's further argument that the statutory grant of exclusive jurisdiction in any way distinguishes this aspect of the case from our earlier decisions in which both the state and federal courts had power to grant the desired relief. |