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                                                                    EXHIBIT 23.1

                        CONSENT OF INDEPENDENT AUDITORS

We consent to the reference to our firm under the caption "Experts" and to the
use of our reports dated March 8, 2000, in the Registration Statement (Form S-4)
of Metromedia Fiber Network, Inc. for the registration of 62,500,000 shares of
its Class A Common Stock.

                                          /s/ Ernst & Young LLP


New York, New York
January 10, 2001



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