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☐ ☐ ☑ ☐ UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON , DC 20549 FORM 20 - F 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 Date of event requiring this shell company report : Not applicable For the transition period from to Commission file number 001-38802 CASTOR MARITIME INC . ( Exact name of Registrant as specified in its charter ) ( Translation of Registrant's name into English ) Republic of the Marshall Islands ( Jurisdiction of incorporation or organization ) 223 Christodoulou Chatzipavlou Street Hawaii Royal Gardens 3036 Limassol , Cyprus ( Address of principal executive offices ) Petros Panagiotidis , Chairman , Chief Executive Officer and Chief Financial Officer 223 Christodoulou Chatzipavlou Street , Hawaii Royal Gardens , 3036 Limassol , Cyprus Phone number : +357 25 357 767 Fax Number : +357 25 357 796 ( Name , Telephone , E - mail and / or Facsimile number and Address of Company Contact Person )