Exhibit 5.1


                   Skadden, Arps, Slate, Meagher & Flom LLP
                               919 Third Avenue
                           New York, New York 10022
                              TEL: (212) 735-3000
                              FAX: (212) 735-2000


                                                  January 27, 1998


          Teligent, Inc.
          8065 Leesburg Pike
          Vienna, Virginia  22182

                        Re:   Registration Statement on Form S-8

          Ladies and Gentlemen:

                     We have acted as special counsel to Teligent, Inc., a
          Delaware corporation (the "Company"),  in connection with the
          preparation of a Registration Statement on Form S-8 (the
          "Registration Statement"), for the purpose of registering with
          the Securities and Exchange Commission, under the Securities Act
          of 1933, as amended (the "Act"), 14,729,125 shares (the "Shares")
          of Class A Common Stock, par value $.01 per share, of the Company
          issuable upon the exercise of options, or pursuant to other
          awards, granted under the Teligent, Inc. 1997 Stock Incentive
          Plan (the "Plan").

                    This opinion is being furnished in accordance with the
          requirements of Item 601(b)(5) of Regulation S-K under the Act.

                    In connection with this opinion, we have examined and
          are familiar with originals or copies, certified or otherwise
          identified to our satisfaction, of (i) the Registration
          Statement, (ii) the Plan, (iii) the Certificate of Incorporation
          and By-Laws of the Company, each as currently in effect, (iv) a
          specimen certificate representing the Shares and (v) certain
          resolutions adopted by the Board of Directors of the Company
          relating to the approval and adoption of the Plan, the issuance
          of the Shares and certain related matters.  We have also examined
          such other documents, certificates and records as we have deemed
          necessary or appropriate as a basis for the opinion set forth
          herein.  In our examination, we have assumed the genuineness of
          all signatures, the legal capacity of natural persons, the
          authenticity of all documents submitted to us as certified,
          conformed or photostatic copies and the authenticity of the
          originals of such copies.  As to any facts material to the
          opinion expressed herein which we have not independently
          established or verified, we have relied upon statements and
          representations of officers and other representatives of the
          Company and others. 

                     We have also assumed that each award agreement setting
          forth the terms of each grant of options or other award under the
          Plan (each, an "Award Agreement") will be consistent with the
          Plan and will be duly authorized and validly executed and
          delivered by the parties thereto, and that the consideration
          received by the Company for the Shares delivered pursuant to such
          option exercise or other award under the Plan will be in an
          amount at least equal to the par value of such Shares.

                    The opinion expressed herein is limited to the Delaware
          General Corporation Law, and we express no opinion as to the laws
          of any other jurisdiction.

                    Based upon and subject to the foregoing, we are of the
          opinion that the Shares have been duly authorized for issuance
          and, when Shares have been paid for and certificates therefor
          have been issued and delivered upon the exercise of options, or
          otherwise pursuant to an award, duly granted under the Plan, in
          each case in accordance with the terms of the Plan and the
          applicable Award Agreement, such Shares will be validly issued,
          fully paid and nonassessable.

                    We hereby consent to the filing of this opinion as an
          exhibit to the Registration Statement.  In giving such consent,
          we do not thereby admit that we are in the category of persons
          whose consent is required under Section 7 of the Act or the Rules
          and Regulations promulgated thereunder.

                                        Very truly yours,

                                        /s/ Skadden, Arps, Slate, Meagher &
                                            Flom LLP