International Maritime Organization facts for kids

Quick facts for kids
International Maritime Organization

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Abbreviation	IMO, OMI
Formation	17 March 1948; 78 years ago (1948-03-17)
Type	United Nations specialized agency
Legal status	Active
Headquarters	London, United Kingdom
Head	Secretary-General Arsenio Dominguez
Parent organization	United Nations Economic and Social Council

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The International Maritime Organization (IMO) is a special agency of the United Nations. It creates rules for ships and shipping around the world. The IMO helps make sure that ships are safe and that they do not harm the environment.

The IMO was first agreed upon in 1948. However, it took ten years to officially start. Its first meeting was on January 6, 1959. The IMO's main office is in London, United Kingdom. As of 2025, 176 countries are members, along with three associate members.

The main goal of the IMO is to create a complete set of rules for shipping. These rules cover ship safety, protecting the ocean environment, and legal matters. The IMO is run by an assembly of its member countries. This group meets every two years. A council of 40 members manages its money and daily operations. The IMO's work is done through five main committees. These committees get help from smaller technical groups. Other UN groups and approved non-profit organizations can also observe the IMO's meetings.

The IMO has a permanent team of employees. These staff members come from different member countries. The team is led by a Secretary-General. This leader is chosen by the assembly. There are also different departments, like those for marine safety and environmental protection.

How the IMO Started and Grew

Plaques at the IMO Headquarters, showing its history and a model of the Queen Mary 2 ship.

In 1948, the United Nations held a meeting in Geneva. They decided to create an international group to make shipping safer. Before this, rules for ship safety were made bit by bit. For example, the first Safety of Life at Sea Convention was made in 1914. This happened after the terrible sinking of the Titanic.

The new group was first called the Inter-Governmental Maritime Consultative Organization (IMCO). Many countries were slow to agree to it. So, it took until March 1958 for it to officially begin. IMCO held its first meeting in London in January 1959. Its first job was to update the SOLAS rules. The updated rules, from 1960, were later revised in 1974. They continue to be updated to keep up with new safety needs and technology.

Since 1978, the last Thursday of September is celebrated as World Maritime Day. This day highlights the importance of shipping safety and the marine environment.

When IMCO started, it also took over other existing rules. One important rule was the International Convention for the Prevention of Pollution of the Sea by Oil (OILPOL) from 1954. IMCO helped update this rule several times.

An oil spill on a beach, showing pollution.

As more oil was transported by sea, people saw a greater need to prevent pollution. This became very clear in 1967. The tanker ship Torrey Canyon hit the seabed near the English Channel. It spilled a huge amount of oil, about 120,000 tons. This accident led to many new rules.

The IMO held an urgent meeting to discuss marine pollution. In 1969, the IMO decided to host a big international meeting in 1973. The goal was to create a global agreement to control pollution from ships at sea. Over the next few years, the IMO introduced many ways to prevent big ship accidents. They also worked to reduce the effects of pollution. This included pollution from routine ship tasks, like cleaning oil tanks.

The most important outcome of this meeting was the International Convention for the Prevention of Pollution from Ships, 1973 (MARPOL). This convention covers pollution from oil, chemicals, packaged goods, sewage, garbage, and even air pollution. The original MARPOL was signed in 1973. However, it did not become active until 1983. This was after more countries agreed to it. As of December 2025, 162 countries have signed the MARPOL convention. These countries represent almost all of the world's shipping.

The IMO also helped create other important international rules. These include the International Convention on Load Lines (1966) and the International Regulations for Preventing Collisions at Sea (1972). In 1975, the IMO decided that all new rules should use SI units (the metric system). However, shipping still uses some older units like the nautical mile for distance.

In 1975, IMCO changed its name to the International Maritime Organization (IMO). This change became official in May 1982. Since then, the IMO has continued to create new rules. These rules cover many topics. They include safety, pollution, navigation, search and rescue, and even how to train sailors. More recently, the IMO added rules for ship security. This was done through the ISPS Code. The IMO also focuses on reducing smoke from ships. In 1983, the IMO started the World Maritime University in Sweden. This university helps train future maritime experts.

In December 2002, the IMO adopted the ISPS Code. This code became mandatory on July 1, 2004. It set up strict security rules for international shipping. This includes plans for ship and port security.

On January 1, 2017, the IMO introduced the International Code for Ships Operating in Polar Waters (Polar Code). This code sets special rules for ships sailing in the cold Arctic and Antarctic.

In 2025, the IMO updated its logo. The new logo includes the organization's name in all six official UN languages.

Where the IMO is Located

The IMO building seen from across the River Thames in London.

The IMO's main office is in a large building in London, United Kingdom. It faces the River Thames on the Albert Embankment. The organization moved into this new building in late 1982. Queen Elizabeth II officially opened it on May 17, 1983. The building's front has a huge bronze sculpture. It looks like the front of a ship, with a sailor keeping watch.

How the IMO Works

The IMO has an Assembly, a Council, and five main Committees. A Secretary-General leads the organization. Several smaller Sub-Committees help the main technical committees.

Who Leads the IMO

A wall at the IMO honoring past Secretaries-General.

Former and current IMO Secretaries-General.

The highest governing body of the IMO is the Assembly. It meets every two years. Between these meetings, a Council acts as the governing body. This Council has 40 member countries chosen by the Assembly. The technical work of the IMO is done by various Committees. The main office staff, called the Secretariat, has about 300 international employees. They are led by the Secretary-General.

The current Secretary-General is Arsenio Dominguez. He started his four-year term on January 1, 2024. He was chosen in July 2023.

Main Committees of the IMO

The IMO's main assembly chamber, where important committees meet.

The IMO's technical work is done by five main Committees:

• The Maritime Safety Committee (MSC): This committee focuses on making shipping safe.
• The Marine Environment Protection Committee (MEPC): This committee works to protect the ocean from ship pollution.
• The Legal Committee: This committee deals with legal issues related to shipping.
• The Technical Cooperation Committee: This committee helps countries improve their maritime skills and knowledge.
• The Facilitation Committee: This committee aims to make international shipping easier. It simplifies paperwork and procedures.

Maritime Safety Committee's Role

The main Plenary Hall of the IMO, where the Maritime Safety Committee holds its meetings.

The Maritime Safety Committee (MSC) is the most important technical committee. It looks after the work of its smaller sub-committees. It also starts new projects. One big topic it handles is how human actions affect ship accidents. The MSC has created rules for how ships should be managed. These rules make sure that agreed safety steps are followed by both ship crews and shore staff.

Supporting Sub-Committees

The Maritime Safety Committee (MSC) and the Marine Environment Protection Committee (MEPC) get help from several sub-committees. All member countries can join these sub-committees. They include:

• Sub-Committee on Human Element, Training and Watchkeeping (HTW)
• Sub-Committee on Implementation of IMO Instruments (III)
• Sub-Committee on Navigation, Communications and Search and Rescue (NCSR)
• Sub-Committee on Pollution Prevention and Response (PPR)
• Sub-Committee on Ship Design and Construction (SDC)
• Sub-Committee on Ship Systems and Equipment (SSE)
• Sub-Committee on Carriage of Cargoes and Containers (CCC)

Who are the IMO Members?

Flags of member countries displayed at the IMO building.

To become a member of the IMO, a country must agree to the Convention on the International Maritime Organization. As of 2025, the IMO has 176 member countries. This includes 175 UN member states and the Cook Islands. Canada was the first country to join in October 1948. It took until March 1958 for enough countries (21) to join for the IMO to officially start.

Here are the current members and the year they joined:

The three associate members are the Faroe Islands (2002), Hong Kong (1967) and Macau (1990).

The newest members include Armenia (January 2018), Nauru (May 2018), Botswana (October 2021), and Kyrgyzstan (February 2024). Many countries that are not IMO members are landlocked, meaning they have no coastline.

Rules and Agreements by IMO

The IMO creates about 60 important legal documents. These documents help member countries make their own rules. They aim to improve safety at sea, make trade easier, and protect the marine environment. Two of the most famous are the International Convention for the Safety of Life at Sea (SOLAS) and the International Convention for the Prevention of Pollution from Ships (MARPOL).

The IMO also holds treaties that are waiting to be approved by countries. An example is the HNS Convention, which deals with damage from dangerous substances.

The IMO regularly makes new rules. National and local maritime groups in member countries enforce these rules. For example, the International Regulations for Preventing Collisions at Sea (COLREG) helps ships avoid crashes. The IMO also allows countries to inspect foreign ships visiting their ports. This is called Port state control.

Some key conventions and codes include:

• MARPOL Convention: Prevents pollution from ships.
• SOLAS Convention: Focuses on the safety of life at sea.
  • IMDG Code: Rules for carrying dangerous goods.
  • ISPS Code: Rules for ship and port security.
  • Polar Code: Special rules for ships in polar areas.
• STCW Convention: Sets standards for training and certifying sailors.
• International Code of Signals: Used for communication between all ships.
• International Ballast Water Management Convention: Manages ship ballast water to prevent spreading harmful organisms.
• International Convention on Maritime Search and Rescue (SAR Convention): Helps coordinate search and rescue efforts at sea.
• International Regulations for Preventing Collisions at Sea (COLREG): Rules to prevent ships from colliding.
• International Convention on Load Lines (CLL): Sets limits on how much cargo a ship can carry.

What the IMO is Working on Now

The IMO is always working on new ways to make shipping safer and cleaner.

Protecting the Environment

Reducing Ship Emissions

The IMO plays a part in fighting climate change. It works to reduce greenhouse gas emissions from ships. In April 2025, the Marine Environment Protection Committee (MEPC) approved new rules. These rules aim for the global shipping industry to reach net-zero emissions by or around 2050. These changes would require ship owners to use cleaner fuels. However, the official adoption of these rules was delayed in October 2025.

Managing Ballast Water

The IMO has also taken steps to control ballast water from ships. Ballast water is used to keep ships stable. But it can carry tiny marine creatures to new places, harming local ecosystems. The 2004 Ballast Water Management Convention helps manage this. It became active in September 2017.

Controlling Biofouling

In April 2025, the IMO agreed to create new rules for controlling biofouling. Biofouling is when marine organisms like barnacles stick to ship hulls. This makes ships less efficient and can spread invasive species. Controlling biofouling helps ships move better and protects the environment.

Improving Maritime Safety

IMO Secretary General Dominguez at a 2024 meeting of the Maritime Safety Committee.

The IMO has developed an e-Navigation system. This system helps ships navigate safely using modern technology. It connects ship navigation with shore services. This plan was completed in 2014 and put into action that November.

Since January 1, 2011, ECDIS (Electronic Chart Display Information Systems) became required for new ships. All existing ships had to update to this system by July 1, 2018.

In December 2023, the IMO adopted a resolution about "Shadow fleet" or "dark fleet" tankers. These ships operate without proper safety checks. They pose risks to the environment and other ships. The resolution asks countries to enforce rules that control transfers of cargo at sea.

In June 2025, the IMO updated rules for pilot ladder safety. These changes will help make it safer for pilots to board and leave ships. They will take effect on January 1, 2028.

Ensuring Fishing Safety

The IMO's Cape Town Agreement is an international agreement from 2012. It sets minimum safety rules for large fishing vessels. The Agreement is set to come into force in February 2027. This will happen one year after Argentina ratified it.

See also

• Active Shipbuilding Experts' Federation
• IMO number
• International Hydrographic Organization
• International Maritime Law Institute
• International Maritime Rescue Federation
• United Nations Convention on the Law of the Sea
• Standard Marine Communication Phrases
• NAVAREA