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The reader should not assume that the information is accurate and complete.

  UNITED STATES SECURITIES AND EXCHANGE COMMISSION OMB APPROVAL
  Washington, D.C. 20549
FORM 13F
OMB Number:   3235-0006
Expires:          July 31, 2015
Estimated average burden
hours per response:       23.8


FORM 13F COVER PAGE


Report for the Calendar Year or Quarter Ended:
12-31-2016
 
Check here if Amendment:      Amendment Number:
 
This Amendment (Check only one.):      is a restatement.
       adds new holdings entries.

Institutional Investment Manager Filing this Report:

Name: Banco Santander, S.A. 
Address: Ciudad Grupo Santander 
  Boadilla Del Monte 
  Madrid  U3  28660 

Form 13F File Number:   028-04177 


The institutional investment manager filing this report and the person by whom it is signed hereby represent that the person signing the report is authorized to submit it, that all information contained herein is true, correct and complete, and that it is understood that all required items, statements, schedules, lists, and tables, are considered integral parts of this form.

Person Signing this Report on Behalf of Reporting Manager:

Name: Jose Galiana Guiu 
Title: Deputy Chief Accounting Officer 
Phone: 34-91-289-74-900 

Signature, Place, and Date of Signing:

/s/ Jose Galiana Guiu  Madrid,  SPAIN 02-14-2017 
[Signature] [City, State] [Date]

Do you wish to provide information pursuant to Special Instruction 5?    X  Yes            No

Additional Information

This filing includes securities owned by Banco Santander (Mexico), S.A., Institucion de Banca Multiple, Grupo Financiero Santander Mexico, which is listed on line 4 on the List of Other Included Managers but does not have a CIK number as of the date of this filing. This filing will be amended to include the CIK number once it has been received.

Report Type (Check only one.):

X  13F HOLDINGS REPORT. (Check here if all holdings of this reporting manager are reported in this report.)

      13F NOTICE. (Check here if no holdings reported are in this report, and all holdings are reported by other reporting manager(s).)

      13F COMBINATION REPORT. (Check here if a portion of the holdings for this reporting manager are reported in this report and a portion are reported by other reporting manager(s).)


Form 13F Summary Page

Report Summary:

Number of Other Included Managers: 12 
Form 13F Information table Entry Total: 329 
Form 13F Information table Value Total: 3,794,667 
  (thousands)

List of Other Included Managers:

Provide a numbered list of the name(s) and Form 13F number(s) of all institutional investement managers with respect to which this report is filed, other than the manager filing this report.

   No. Form 13F File Number Name CIK
  Open Bank, S.A.  0001697458 
  Banco Santander (Brasil) S.A.  0001471055 
  Cartera Mobiliaria SICAV SA  0001697455 
  Santander Mexico Financial Group, S.A.B. de C.V.  0001551975 
  Banco Madesant, S.U., S.A.  0001697428 
  SANTANDER INVESTMENT SECURITIES INC.  0000931371 
  Santander Seguros y Reaseguros, Compania Aseguradora, S.A.  0001697461 
  Santander Holdings USA, Inc.  0000811830 
  Santander Cards UK Ltd.  0001697460 
10    ABBEY NATIONAL TREASURY SERVICES PLC/ENG  0000931061 
11    Banco Santander International  0001697453 
12    Banco Santander (Suisse) SA  0001697263 
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