Appellants seek to appeal the district court’s order denying relief on their motion objecting to the referral of pretrial matters to the magistrate judge for report and recommendation. We dismiss the appeal for lack of jurisdiction because the notice of appeal was not timely filed.

When the United States is a party, a notice of appeal must be filed no more than sixty days after the entry of the district court’s final judgment or order, Fed. R.App. P. 4(a)(1)(B), unless the district court extends the appeal period under Fed. R.App. P. 4(a)(5) or reopens the appeal period under Fed. R.App. P. 4(a)(6). This appeal period is “mandatory and jurisdictional.” Browder v. Director, Dep’t of Corr., 434 U.S. 257, 264, 98 S.Ct. 556, 54 L.Ed.2d 521 (1978) (quoting United States v. Robinson, 361 U.S. 220, 229, 80 S.Ct. 282, 4 L.Ed.2d 259 (1960)).

The district court’s amended judgment was entered on the docket on November 1, 2005, and the Appellants filed their notice of appeal on January 25, 2006. Because the Appellants failed to file a timely notice of appeal or obtain an extension or reopening of the appeal period, we dismiss the appeal. Even if the notice of appeal could be construed as a timely appeal from the district court’s continued referral of matters to the magistrate judge, we lack jurisdiction over the appeal as the order is neither final nor an appeal-able interlocutory or collateral order. See 28 U.S.C. §§ 1291, 1292 (2000); Fed.R.Civ.P. 54(b); Cohen v. Beneficial Indus. Loan Corp., 337 U.S. 541, 69 S.Ct. 1221, 93 L.Ed. 1528 (1949).

We dispense with oral argument because the facts and legal contentions are adequately presented in the materials before *308 the court and argument would not aid the decisional process.

DISMISSED.