Company: TNRSF
Filing Date: 2025-08-01
Form Type: 6-K
Source: 0001171843-25-004951
Chunk: 0

Company: TENARIS SA
Filing Date: 2025-08-01
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 Private Issuer

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

the Securities Exchange Act of 1934</div>

As of 30 July, 2025

<div align='center'>TENARIS, S.A.

(Translation of Registrant's name into English)

26, Boulevard Royal, 4th floor

L-2449 Luxembourg

(Address of principal executive offices)

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

Form 20-F Form 40-F</div>

The attached material is being furnished to the Securities and Exchange Commission pursuant
to Rule 13a-16 and Form 6-K under the Securities Exchange Act of 1934, as amended. This report contains Tenaris S.A. Half-year report
2025 – Interim management report.

<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: 30 July 2025

<div align='center'>Tenaris, S.A.</div>

By: /s/ Giovanni Sardagna

Giovanni Sardagna

Investor Relations Officer

CERTAIN DEFINED TERMS Unless otherwise specified or if the context so requires:

| · | References                                                                   
 in this half-year report to “the Company” are exclusively to Tenaris S.A., a 
 Luxembourg société anonyme.                                                  |

| · | References                                                                                      
 in this half-year report to “Tenaris”, “we”, “us” or                                            
 “our” are to Tenaris S.A. and its consolidated subsidiaries. See “II. Accounting                
 Policies A. Basis of presentation” and “II. Accounting Policies B. Group accounting”            
 to our unaudited consolidated condensed interim financial statements included in this half-year 
 report.                                                                                         |

| · | References                                                                      
 in this half-year report to “San Faustin” are to San Faustin S.A., a Luxembourg 
 société anonyme and the Company’s controlling shareholder.                      |

| · | “shares”                                                    
 refers to ordinary shares, par value $1.00, of the Company.