EXHIBIT 99.3
 
                         LEVEL 3 COMMUNICATIONS, INC.
 
                               OFFER TO EXCHANGE
                  UP TO $2,000,000,000 IN PRINCIPAL AMOUNT OF
                         9 1/8% SENIOR NOTES DUE 2008
                                      FOR
                     $2,000,000,000 IN PRINCIPAL AMOUNT OF
                    9 1/8% SENIOR NOTES DUE 2008 ISSUED AND
                SOLD IN A TRANSACTION EXEMPT FROM REGISTRATION
                 UNDER THE SECURITIES ACT OF 1933, AS AMENDED
 
To Our Clients:
 
  Enclosed for your consideration is a Prospectus dated [           ], 1998
(as the same may be amended or supplemented from time to time, the
"Prospectus") and a form of Letter of Transmittal (the "Letter of
Transmittal") relating to the offer (the "Exchange Offer") by Level 3
Communications, Inc. (the "Company") to exchange up to $2,000,000,000 in
principal amount of its 9 1/8% Senior Notes due 2008 (the "New Notes") for
$2,000,000,000 in principal amount of its 9 1/8% Senior Notes due 2008, issued
and sold in a transaction exempt from registration under the Securities Act of
1933, as amended (the "Original Notes").
 
  The material is being forwarded to you as the beneficial owner of Original
Notes carried by us for your account or benefit but not registered in your
name. A tender of any Original Notes may be made only by us as the registered
holder and pursuant to your instructions. Therefore, the Company urges
beneficial owners of Original Notes registered in the name of a broker,
dealer, commercial bank, trust company or other nominee to contact such
registered holder promptly if they wish to tender Original Notes in the
Exchange Offer.
 
  Accordingly, we request instructions as to whether you wish us to tender any
or all Original Notes, pursuant to the terms and conditions set forth in the
Prospectus and Letter of Transmittal. We urge you to read carefully the
Prospectus and Letter of Transmittal before instructing us to tender your
Original Notes.
 
  YOUR INSTRUCTIONS TO US SHOULD BE FORWARDED AS PROMPTLY AS POSSIBLE IN ORDER
TO PERMIT US TO TENDER ORIGINAL NOTES ON YOUR BEHALF IN ACCORDANCE WITH THE
PROVISIONS OF THE EXCHANGE OFFER. The Exchange Offer will expire at 5:00 p.m.,
Eastern Standard Time, on [day of week] [        ], 1998, unless extended (the
"Expiration Date"). Original Notes tendered pursuant to the Exchange Offer may
be withdrawn, subject to the procedures described in the Prospectus, at any
time prior to the Expiration Date.
 
  If you wish to have us tender any or all of your Original Notes held by us
for your account or benefit, please so instruct us by completing, executing
and returning to us the instruction form that appears below. The accompanying
Letter of Transmittal is furnished to you for informational purposes only and
may not be used by you to tender Original Notes held by us and registered in
our name for your account or benefit.

 
                                 INSTRUCTIONS
 
  The undersigned acknowledge(s) receipt of your letter and the enclosed
material referred to therein relating to the Exchange Offer of Level 3
Communications, Inc.
 
  THIS WILL INSTRUCT YOU TO TENDER THE PRINCIPAL AMOUNT OF ORIGINAL NOTES
INDICATED BELOW HELD BY YOU FOR THE ACCOUNT OR BENEFIT OF THE UNDERSIGNED,
PURSUANT TO THE TERMS OF AND CONDITIONS SET FORTH IN THE PROSPECTUS AND THE
LETTER OF TRANSMITTAL.
 
Box 1 [_] Please tender my Original Notes held by you for my account or
          benefit. I have identified on a signed schedule attached hereto the
          principal amount of Original Notes to be tendered if I wish to tender
          less than all of my Original Notes.
 
Box 2 [_] Please do not tender any Original Notes held by you for my account
          or benefit.
 
Date:       , 1998
 
 
                                          _____________________________________
 
 
                                          _____________________________________
                                                      Signature(s)
 
 
                                          _____________________________________
 
 
                                          _____________________________________
                                                Please print name(s) here
 
________
Unless a specific contrary instruction is given in a signed Schedule attached
hereto, your signature(s) hereon shall constitute an instruction to us to
tender all of your Original Notes.
 
                                       2