The September 11th terrorist attacks in the United States have had profound impact on the safety and security of shipping and port operations in the Asia Pacific region and beyond. Serious attention has been given to the use of ships and their cargoes as potential terrorist weapons. Security policy measures have been adopted to prevent shipping from becoming a target for international terrorism. The international community recognized the need to review the measures already adopted by the international organizations, in particular the United Nations and its specialized agencies, to combat acts of violence and crime at sea, and to adopt new regulations to enhance ship and port security. The purpose of this paper is to conduct an inquiry, aiming to find out to want extent the following selected international maritime instruments, in particular related to safety and security of shipping and port operations, had been accepted or ratified by members of the Track One and Track Two organizations in the Asia-Pacific region, both in the economic and security realm, namely APEC, PECC, ASEAN, ARF and CSCAP. The instruments selected for study include: (1) 1982 UNCLOS; (2) Convention on the International Maritime Organization; (3) SOLAS 1974; (4) SOLAS PROT 1978; (5) SOLAS PROT 1988; (6) 2002 ISPS Code; (7) ISM Code; (8) SUA 1988; (9) SUA PROT 1988; (10) STCW 1978; (11) The Seafarers' Identity Documents Convention, 1958 (C No. 108); (12) The Seafarers' Identity Documents Convention (Revised), 2003 (C No. 185); (13) SAR 1979; and (14) CSC 1972.