Cite as: 516 U. S. 299 (1996)
Opinion of the Court
5a. Petitioner filed a notice of appeal, which, on respondent's motion, the District Court certified as frivolous. In an unpublished order, the Ninth Circuit dismissed the appeal "for lack of jurisdiction." Pelletier v. Federal Home Loan Bank of San Francisco, No. 94-56507 (CA9, Nov. 17, 1994), reprinted in App. to Pet. for Cert. 1a. We granted certiorari, 514 U. S. 1035 (1995).
II
Section 1291 of Title 28, U. S. C., gives courts of appeals jurisdiction over "all final decisions" of district courts, except those for which appeal is to be had to this Court. The requirement of finality precludes consideration of decisions that are subject to revision, and even of "fully consummated decisions [that] are but steps towards final judgment in which they will merge." Cohen v. Beneficial Industrial Loan Corp., 337 U. S. 541, 546 (1949). It does not, however, bar review of all prejudgment orders. In Cohen, we described a "small class" of district court decisions that, though short of final judgment, are immediately appealable because they "finally determine claims of right separable from, and collateral to, rights asserted in the action, too important to be denied review and too independent of the cause itself to require that appellate consideration be deferred until the whole case is adjudicated." Ibid. See also Puerto Rico Aqueduct and Sewer Authority v. Metcalf & Eddy, Inc., 506 U. S. 139, 142-145 (1993) (citing Coopers & Lybrand v. Livesay, 437 U. S. 463, 468 (1978)). The issue in the present case is the extent to which orders denying governmental officers' assertions of qualified immunity come within the Cohen category of appealable decisions.
As set forth in Harlow v. Fitzgerald, 457 U. S. 800 (1982), the qualified-immunity defense "shield[s] [government agents] from liability for civil damages insofar as their conduct does not violate clearly established statutory or constitutional rights of which a reasonable person would have known," id., at 818 (citing Procunier v. Navarette, 434 U. S.
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