This appeal presents — for the second time — a judgment dismissing the plaintiffs complaint with prejudice in a case where federal subject matter jurisdiction does not exist. We previously held that “no constitutional concerns” were created by the district court’s entry of such an order as a procedural sanction, but we nevertheless remanded to the district court for reconsideration.
Hernandez v. Conriv Realty
Assocs.,
I.
Plaintiff originally filed this action in April 1995 in New York State Supreme Court, and defendant subsequently removed the case to the district court. In a memorandum and order dated February 28, 1996, the district court dismissed the complaint with prejudice and ordered plaintiff to pay defendant’s expenses associated with a pretrial conference at which plaintiff did not appear. The order was based on plaintiffs failure to respond to discovery requests, and on his subsequent failure, following his attorney’s withdrawal, to comply with the court’s order to retain new counsel by a date certain or proceed pro se and appear in that capacity at the conference.
On plaintiffs first appeal, we held
sua sponte
that removal had been improper because federal subject matter jurisdiction did not exist.
See Hernandez,
On remand, the district court again ordered dismissal with prejudice, but declined to require plaintiff to pay defendant’s expenses. A final judgment was entered dismissing the case with prejudice, and this second appeal followed.
II.
As noted above, we held previously that an order of dismissal without prejudice as a procedural sanction “creates no constitutional concerns” where subject matter jurisdiction does not exist.
Hernandez,
After further consideration of the issue, we now conclude that where a court lacks subject matter jurisdiction, it also lacks the power to dismiss with prejudice. It is true that such an order, if imposed as a procedural sanction, does not involve an assessment of the merits of the case. Nevertheless, we believe that Article Ill’s limits on federal jurisdiction are designed not only to prevent federal courts from assessing the merits of certain disputes, but also to prevent federal courts from interfering—through such assessments or othenvise—with the jurisdiction of state courts over certain cases, such as this one, that do not implicate federal interests. A dismissal with prejudice interferes with state court jurisdiction because it “has the effect of a final adjudication on the merits favorable to [the] defendant,” and therefore has res judicata effect—that is, it “bars future suits brought by [the] plaintiff upon the same cause of action,”
Samuels v. Northern Telecom, Inc.,
*124 Accordingly, we vacate the judgment of the district court dismissing the case with prejudice, and remand the cause to the district court. We instruct the district court, in turn, to enter an order to remand to the state court. See 28 U.S.C. § 1447(c) (“If at any time before final judgment it appears that the district court lacks subject matter jurisdiction, the case shall be remanded.”).
III.
In sum, we hold that, because the district court lacked subject matter jurisdiction, it did not have the power to dismiss the complaint with prejudice. The judgment is vacated and the cause remanded to the district court with instructions to remand to the state court.
Notes
. Because of the conflict between this holding and the precedent established by our previous decision, this opinion has been circulated to all of the active judges of the Court, none of whom objects to this holding.
. We noted that the Ninth Circuit had relied on
Willy
to reach the same conclusion.
See In re Exxon Valdez,
. Although we hold that federal courts lack the power to dismiss a case with prejudice
*124
where subject matter jurisdiction does not exist, we note that, in the interest of finality, collateral attacks on subject matter jurisdiction are not permitted.
See Willy,
