UNITED STATES
                        SECURITIES EXCHANGE COMMISSION
                            Washington, D.C. 20549

--------------------------------------------------------------------------------

                                 SCHEDULE 13G

                   Under the Securities Exchange Act of 1934
                               (Amendment No. )

                             NALCO HOLDING COMPANY
                             ---------------------
                               (Name of Issuer)


                    Common Stock, par value $0.01 per share
                -----------------------------------------------
                        (Title of Class of Securities)


                                   62985Q101
                               -----------------
                                (CUSIP Number)


                                 July 27, 2006
                             --------------------
            (Date of Event which Requires Filing of this Statement)


Check  the  appropriate  box to  designate  the rule  pursuant  to which  this
Schedule is filed:

                             [ ]     Rule 13d-1(b)

                             [X]     Rule 13d-1(c)

                             [ ]     Rule 13d-1(d)

* The  remainder  of this  cover  page  shall be  filled  out for a  reporting
person's  initial  filing on this form with  respect to the  subject  class of
securities,  and for any subsequent  amendment  containing  information  which
would alter the disclosures provided in a prior cover page.

The  information  required  in the  remainder  of this cover page shall not be
deemed to be "filed" for the purpose of Section 18 of the Securities  Exchange
Act of 1934 ("Act") or otherwise subject to the liabilities of that section of
the Act but shall be subject to all other provisions of the Act (however,  see
the Notes).


                         Continued on following pages
                              Page 1 of 10 Pages
                             Exhibit Index: Page 9





                                 SCHEDULE 13G

CUSIP No.: 62985Q101                                         Page 2 of 10 Pages
--------------------------------------------------------------------------------
1.          Names of Reporting Persons.

            I.R.S. Identification Nos. of above persons (entities only).

            GLENVIEW CAPITAL MANAGEMENT, LLC
--------------------------------------------------------------------------------
2.          Check the Appropriate Box if a Member of a Group

            (a) [ ]

            (b) [ ]
--------------------------------------------------------------------------------
3.          SEC Use Only
--------------------------------------------------------------------------------
4.          Citizenship or Place of Organization

            Delaware
--------------------------------------------------------------------------------
Number of Shares          5     Sole Voting Power            None
Beneficially Owned by     ------------------------------------------------------
Each Reporting Person     6.    Shared Voting Power          8,481,167
With                      ------------------------------------------------------
                          7.    Sole Dispositive Power       None
                          ------------------------------------------------------
                          8.    Shared Dispositive Power     8,481,167
--------------------------------------------------------------------------------
9.          Aggregate Amount Beneficially Owned by Each Reporting Person

            8,481,167
--------------------------------------------------------------------------------
10.         Check if the Aggregate Amount in Row (9) Excludes Certain Shares
            (See Instructions)

            [  ]
--------------------------------------------------------------------------------
11.         Percent of Class Represented by Amount in Row (9)

            5.9% based on 142,896,612 shares outstanding as of April 28, 2006.
--------------------------------------------------------------------------------
12.         Type of Reporting Person:

            OO




                                 SCHEDULE 13G

CUSIP No.: 62985Q101                                         Page 3 of 10 Pages
--------------------------------------------------------------------------------
1.          Names of Reporting Persons.

            I.R.S. Identification Nos. of above persons (entities only).

            GLENVIEW CAPITAL GP, LLC
--------------------------------------------------------------------------------
2.          Check the Appropriate Box if a Member of a Group

            (a) [ ]

            (b) [ ]
--------------------------------------------------------------------------------
3.          SEC Use Only
--------------------------------------------------------------------------------
4.          Citizenship or Place of Organization

            Delaware
--------------------------------------------------------------------------------
Number of Shares          5     Sole Voting Power            None
Beneficially Owned by     ------------------------------------------------------
Each Reporting Person     6.    Shared Voting Power          8,481,167
With                      ------------------------------------------------------
                          7.    Sole Dispositive Power       None
                          ------------------------------------------------------
                          8.    Shared Dispositive Power     8,481,167
--------------------------------------------------------------------------------
9.          Aggregate Amount Beneficially Owned by Each Reporting Person

            8,481,167
--------------------------------------------------------------------------------
10.         Check if the Aggregate Amount in Row (9) Excludes Certain Shares
            (See Instructions)

            [  ]
--------------------------------------------------------------------------------
11.         Percent of Class Represented by Amount in Row (9)

            5.9% based on 142,896,612 shares outstanding as of April 28, 2006.
--------------------------------------------------------------------------------
12.         Type of Reporting Person:

            OO




                                 SCHEDULE 13G

CUSIP No.: 62985Q101                                         Page 4 of 10 Pages
--------------------------------------------------------------------------------
1.          Names of Reporting Persons.

            I.R.S. Identification Nos. of above persons (entities only).


            LAWRENCE M. ROBBINS
--------------------------------------------------------------------------------
2.          Check the Appropriate Box if a Member of a Group

            (a) [ ]

            (b) [ ]
--------------------------------------------------------------------------------
3.          SEC Use Only
--------------------------------------------------------------------------------
4.          Citizenship or Place of Organization

            United States of America
--------------------------------------------------------------------------------
Number of Shares          5     Sole Voting Power            None
Beneficially Owned by     ------------------------------------------------------
Each Reporting Person     6.    Shared Voting Power          8,481,167
With                      ------------------------------------------------------
                          7.    Sole Dispositive Power       None
                          ------------------------------------------------------
                          8.    Shared Dispositive Power     8,481,167
--------------------------------------------------------------------------------
9.          Aggregate Amount Beneficially Owned by Each Reporting Person

            8,481,167
--------------------------------------------------------------------------------
10.         Check if the Aggregate Amount in Row (9) Excludes Certain Shares
            (See Instructions)

            [  ]
--------------------------------------------------------------------------------
11.         Percent of Class Represented by Amount in Row (9)

            5.9% based on 142,896,612 shares outstanding as of April 28, 2006.
--------------------------------------------------------------------------------
12.         Type of Reporting Person:

            IA





                                                            Page 5 of 10 Pages

Item 1(a). Name of Issuer:

           NALCO Holding Company (the "Issuer").

Item 1(b). Address of Issuer's Principal Executive Offices:

           1601 W. Diehl Road, Naperville, Illinois 60563.

Item 2(a). Name of Person Filing

           This Statement is filed on behalf of each of the following  persons
(collectively, the "Reporting Persons"):

           i) Glenview Capital Management, LLC ("Glenview Capital Management");

           ii) Glenview Capital GP, LLC ("Glenview Capital GP"); and

           iii) Lawrence M. Robbins ("Mr. Robbins").

           This Statement  relates to Shares (as defined  herein) held for the
accounts of Glenview Capital  Partners,  L.P., a Delaware limited  partnership
("Glenview  Capital  Partners"),  Glenview  Institutional  Partners,  L.P.,  a
Delaware limited partnership  ("Glenview  Institutional  Partners"),  Glenview
Capital  Master  Fund,  Ltd., a Cayman  Islands  exempted  company  ("Glenview
Capital  Master Fund"),  GCM Little Arbor Master Fund,  Ltd., a Cayman Islands
exempted   company  ("GCM  Little  Arbor  Master  Fund");   GCM  Little  Arbor
Institutional  Partners,  L.P., a Delaware  limited  partnership  ("GCM Little
Arbor  Institutional  Partners"),  and GCM  Little  Arbor  Partners,  L.P.,  a
Delaware limited partnership ("GCM Little Arbor Partners").

           Glenview Capital Management serves as investment manager to each of
Glenview Capital Partners,  Glenview Institutional Partners,  Glenview Capital
Master Fund,  GCM Little Arbor  Master  Fund,  GCM Little Arbor  Institutional
Partners,  and GCM Little Arbor Partners.  In such capacity,  Glenview Capital
Management may be deemed to have voting and dispositive  power over the Shares
held  for  the  accounts  of  each  of  Glenview  Capital  Partners,  Glenview
Institutional Partners,  Glenview Capital Master Fund, GCM Little Arbor Master
Fund, GCM Little Arbor Institutional  Partners, and GCM Little Arbor Partners.
Glenview  Capital GP is the  general  partner of  Glenview  Capital  Partners,
Glenview  Institutional  Partners, GCM Little Arbor Institutional Partners and
GCM Little Arbor Partners.  Glenview  Capital GP also serves as the sponsor of
the Glenview Capital Master Fund and the GCM Little Arbor Master Fund. In such
capacities,  Glenview  Capital GP may be deemed to have voting and dispositive
power  over the  Shares  held for the  accounts  of each of  Glenview  Capital
Partners,  Glenview Institutional Partners,  Glenview Capital Master Fund, GCM
Little Arbor Master Fund,  GCM Little Arbor  Institutional  Partners,  and GCM
Little Arbor Partners.  Mr. Robbins is the Chief Executive Officer of Glenview
Capital Management and Glenview Capital GP.

Item 2(b). Address of Principal Business Office or, if None, Residence

           The address of the  principal  business  office of each of Glenview
Capital  Management, Glenview Capital GP, and Mr. Robbins is 767 Fifth Avenue,
44th Floor, New York, New York 10153.





                                                            Page 6 of 10 Pages

Item 2(c). Citizenship

           i) Glenview Capital Management is a Delaware limited liability
company;

           ii) Glenview Capital GP is a Delaware limited liability company;
and

           iii) Mr. Robbins is a citizen of the United States of America.

Item 2(d). Title of Class of Securities:

           Common Stock, par value $0.01 per share (the "Shares").

Item 2(e). CUSIP Number:

           62985Q101.

Item 3.    If This Statement is Filed Pursuant to ss.ss.240.13d-1(b) or
           240.13d-2(b) or (c), Check Whether the Person Filing is a:

           This Item 3 is not applicable.

Item 4.    Ownership:

Item 4(a). Amount Beneficially Owned:

           As of August 4, 2006, each of Glenview Capital Management, Glenview
Capital  GP  and  Mr. Robbins  may  be  deemed  to be the beneficial  owner of
8,481,167  Shares.  This  amount consists  of: (A) 386,400 Shares held for the
account of  Glenview  Capital  Partners;  (B)  4,889,967  Shares  held for the
account of Glenview  Capital  Master Fund;  (C) 2,258,600  Shares held for the
account of Glenview  Institutional  Partners;  (D) 733,300 Shares held for the
account of the GCM Little Arbor Master Fund;  (E) 201,100  Shares held for the
account of GCM Little Arbor Institutional Partners; and (F) 11,800 Shares held
for the account of GCM Little Arbor Partners.

Item 4(b). Percent of Class:

           The number of Shares of which each of Glenview Capital  Management,
Glenview  Capital GP and Mr. Robbins may be deemed to be the beneficial  owner
constitutes  approximately  5.9% of the total  number  of  Shares  outstanding
(based  upon  information  provided  by the Issuer in its most  recently-filed
quarterly report on Form 10-Q, there were 142,896,612 Shares outstanding as of
April 28, 2006).

Item 4(c). Number of Shares of which such person has:

Glenview Capital Management, Glenview Capital GP and Mr. Robbins:
-----------------------------------------------------------------

(i) Sole power to vote or direct the vote:                                  0

(ii) Shared power to vote or direct the vote:                       8,481,167

(iii) Sole power to dispose or direct the disposition of:                   0

(iv) Shared power to dispose or direct the disposition of:          8,481,167





                                                            Page 7 of 10 Pages

Item 5.    Ownership of Five Percent or Less of a Class:

           This Item 5 is not applicable.

Item 6.    Ownership of More than Five Percent on Behalf of Another Person:

           This Item 6 is not applicable.

Item 7.    Identification and Classification of the Subsidiary Which Acquired
           the Security Being Reported on By the Parent Holding Company:

           See disclosure in Item 2 hereof.

Item 8.    Identification and Classification of Members of the Group:

           This Item 8 is not applicable.

Item 9.    Notice of Dissolution of Group:

           This Item 9 is not applicable.

Item 10.   Certification:

           By signing below each of the Reporting  Persons  certifies that, to
the best of their knowledge and belief, the securities  referred to above were
not  acquired  and are not  held for the  purpose  of or with  the  effect  of
changing or  influencing  the control of the issuer of the securities and were
not acquired and are not held in connection  with or as a  participant  in any
transaction having that purpose or effect.





                                                            Page 8 of 10 Pages

                                   SIGNATURE

           After  reasonable  inquiry  and to the  best  of my  knowledge  and
belief,  I certify that the  information  set forth in this statement is true,
complete and correct.

Date: August 7, 2006            GLENVIEW CAPITAL MANAGEMENT, LLC


                                By: /s/ Lawrence M. Robbins
                                    -------------------------------------
                                Name:    Lawrence M. Robbins
                                Title:   Chief Executive Officer

Date: August 7, 2006            GLENVIEW CAPITAL GP, LLC


                                By: /s/ Lawrence M. Robbins
                                    -------------------------------------
                                Name:    Lawrence M. Robbins
                                Title:   Chief Executive Officer

Date: August 7, 2006            LAWRENCE M. ROBBINS

                                /s/ Lawrence M. Robbins
                                -----------------------------------------





                                                            Page 9 of 10 Pages

                                 EXHIBIT INDEX


Ex.                                                                    Page No.
---                                                                    --------

A         Joint Filing Agreement, dated August 7, 2006 by
          and among Glenview Capital Management, LLC, Glenview
          Capital GP, LLC, and Lawrence M. Robbins.........                 10





                                                            Page 10 of 10 Pages

                                   EXHIBIT A

                            JOINT FILING AGREEMENT

           The  undersigned  hereby  agree that the  statement on Schedule 13G
with respect to the Common Stock of NALCO  Holding  Company dated as of August
7, 2006  is, and any  amendments  thereto  (including  amendments  on Schedule
13D) signed by each of the undersigned shall be, filed on behalf of each of us
pursuant to and in accordance  with the  provisions of Rule 13d-1(k) under the
Securities Exchange Act of 1934, as amended.

Date: August 7, 2006            GLENVIEW CAPITAL MANAGEMENT, LLC


                                By: /s/ Lawrence M. Robbins
                                    -------------------------------------
                                Name:    Lawrence M. Robbins
                                Title:   Chief Executive Officer

Date: August 7, 2006            GLENVIEW CAPITAL GP, LLC


                                By: /s/ Lawrence M. Robbins
                                    -------------------------------------
                                Name:    Lawrence M. Robbins
                                Title:   Chief Executive Officer

Date: August 7, 2006            LAWRENCE M. ROBBINS

                                /s/ Lawrence M. Robbins
                                -----------------------------------------