Page 1

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 20 - F ( Mark One ) ☐ Registration statement pursuant to Section 12 ( b ) or 12 ( g ) of the Securities Exchange Act of 1934 or ☐ Annual report pursuant to Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 for the fiscal year ended December 31 , 2020 or ☐ Transition report pursuant to Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 or ☐ Shell company report pursuant to Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 Commission file number : 001-31518 TENARIS S.A. ( Exact name of Registrant as specified in its charter ) N / A ( Translation of Registrant's name into English ) Grand Duchy of Luxembourg ( Jurisdiction of incorporation or organization ) 26 , Boulevard Royal - 4th Floor L - 2449 Luxembourg ( Address of principal executive offices ) Javier Cayzac 26 , Boulevard Royal - 4th Floor L - 2449 Luxembourg Tel . + ( 352 ) 26 47 89 78 , Fax . + ( 352 ) 26 47 89 79 , e - mail : investors@tenaris.com ( Name , Telephone , E - Mail and / or Facsimile number and Address of Company Contact Person )