The International Maritime Organization (IMO), formerly known as the Inter-Governmental Maritime Consultative Organization (IMCO), is a mid-20th century creation. The Convention which established the IMCO was adopted in Geneva in 1948, but it only came into force ten years later; and the new Organization met for the first time the following year in 1959. The IMCO name was changed to IMO in 1982.

Headquartered in London, the IMO is a specialized agency of the United Nations with 168 Member States and three Associate Members. The IMO's primary purpose is to develop and maintain a comprehensive regulatory framework for shipping and its remit today includes safety, environmental concerns, legal matters, technical co-operation, maritime security and the efficiency of shipping. IMO is governed by an Assembly of members and is financially administered by a Council of members elected from the Assembly. The work of IMO is conducted through five committees and these are supported by technical subcommittees. Member organizations of the UN organizational family may observe the proceedings of the IMO. Observer status is granted to qualified non-governmental organizations.

The IMO is supported by a permanent secretariat of employees who are representative of its members. The secretariat is composed of a Secretary-General who is periodically elected by the Assembly, and various divisions such as those for marine safety, environmental protection, and a conference section.

Current issues

Recent initiatives at the IMO have included amendments to SOLAS, which upgraded fire protection standards on passenger ships, the International Convention on Standards of Training, Certification and Watchkeeping for Seafarers (STCW) which establishes basic requirements on training, certification and watchkeeping for seafarers and to the Convention on the Prevention of Maritime Pollution (MARPOL 73/78) which required double hulls on all tankers. All these initiatives were instigated by representatives of the United States before the IMO.

In December 2002, new amendments to the 1974 SOLAS Convention were enacted. These amendments gave rise to the International Ship and Port Facility Security (ISPS) Code, which went into effect on 1 July 2004. The concept of the code is to provide layered and redundant defenses against smuggling, terrorism, piracy, stowaways, etc. The ISPS Code required most ships and port facilities engaged in international trade to establish and maintain strict security procedures as specified in ship and port specific Ship Security Plans and Port Facility Security Plans.

The IMO is also responsible for publishing the International Code of Signals for use between merchant and naval vessels.

The First Intersessional Meeting of IMO’s Working Group on Greenhouse Gas Emissions from Ships is currently taking place in Oslo, Norway (23-27 June, 2008), tasked with developing the technical basis for the reduction mechanisms that may form part of a future IMO regime to control greenhouse gas emissions from international shipping, and a draft of the actual reduction mechanisms themselves, for further consideration by IMO’s Marine Environment Protection Committee (MEPC).

The IMO has also served as a key partner and enabler of U.S. international and interagency efforts to establish Maritime Domain Awareness.