Company: BCDRF
Filing Date: 2025-05-05
Form Type: 6-K
Source: 0000950103-25-005719
Chunk: 0

Company: Banco Santander, S.A.
Filing Date: 2025-05-05
Form: 6-K
Chunk 0
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<div align='center'>FORM 6-K

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Report of Foreign Issuer

Pursuant to Rule 13a-16 or 15d-16 of

the Securities Exchange Act of 1934

For the month of May, 2025

Commission File Number: 001-12518

Banco Santander, S.A.

(Exact name of registrant as specified in its charter)

Ciudad Grupo Santander

28660 Boadilla del Monte (Madrid) Spain

(Address of principal executive office)</div>

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F:

| Form 20-F | X |     | Form 40-F |

<div align='center'>Banco Santander, S.A.

TABLE OF CONTENTS</div>

Item 1

Banco Santander, S.A.(“Banco Santander”or the “Bank”), in compliance with the Securities Market legislation, hereby communicates the following:

<div align='center'>OTHER RELEVANT INFORMATION</div>

| Banco Santander hereby advises                                                                                                                                                     
 that today, Monday 5 May 2025, a presentation will be held to analysts via audio conference call at 15:00 hours (Madrid time) to                                                   
 inform of the sale of 49% of Santander Polska to Erste Bank. The presentation can be followed via the following link: https://grid.trustwavetechnology.com/santander/register.html 
 Likewise, the documentation for                                                                                                                                                    
 this presentation to analysts has been made public prior to its commencement through its notification to the CNMV and publication                                                  
 on the corporate website www.santander.com                                                                                                                                         
 Boadilla del Monte (Madrid), 5 May 2025                                                                                                                                            |

<div align='center'>SIGNATURE</div>

Pursuant to the requirements of the Securities Exchange Act of 1934,
the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

| Date: | May 5, 2025 |     | Banco Santander, S.A. 
 By:                   | /s/ Pedro de Mingo Kaminouchi |                              |
|:------|:------------|:----|:----------------------|:------------------------------|:-----------------------------|
|       |             |     |                       | Name:                         | Pedro