Maritime unions

Every collective bargaining agreement (CBA) on a merchant vessel traces back to a specific union or federation. This directory covers the 12 largest and most consequential seafarer unions worldwide — the ITF (the umbrella federation), the IMEC employer counterpart, national officer + ratings unions in the top seafarer-supplying nations, and the North American, European, and Japanese officer unions that anchor deep-sea CBAs. Each entry covers the union's scope, the key CBA framework it negotiates, and the practical contact route for members with grievances.

• 3F Søfart / Sea Transport, Fagligt Fælles Forbund3F Søfart · Denmark · founded 2005

  Danish sea-transport sector of the general union 3F. Negotiates the DIS CBAs (Dansk Internationalt Skibsregister) covering Danish-flag deep-sea vessels — many operated by Maersk Line, Torm, and DFDS Seaways. Also negotiates DFDS ferry CBAs on the Copenhagen-Oslo, Copenhagen-Świnoujście, and Denmark-Sweden routes.

• 3F Sømændenes Forbund + CO-SeaCO-Sea / 3F · Denmark · founded 1992

  Danish seafarer union (part of 3F transport-workers federation) + CO-Sea is the Nordic seafarer union coordination body (Denmark + Norway + Sweden + Finland). Negotiates the JNG (Joint Negotiating Group) Nordic CBA framework — one of the strongest national CBA frameworks in the world.

• All Japan Seamen's UnionJSU / Zen Nihon Kaiin Kumiai · Japan · founded 1945

  Primary Japanese seafarer union. Founded 1945 during the post-war US Occupation. Represents Japanese officers on the Japan-controlled foreign-flag deep-sea fleet (predominantly NYK, MOL, and K-Line vessels), plus the smaller domestic coastal fleet. Runs the JSU-IBF-signed contracts that cover the majority of Japan-controlled deep-sea tonnage.

• American Maritime OfficersAMO · United States · founded 1949

  Second-largest US maritime officer union. Represents licensed deck and engine officers on US-flag deep-sea contracts (Maersk Line Limited, Overseas Shipholding Group, TOTE Maritime, Crowley Liner Services) plus Great Lakes Steamer Association vessels. Runs Star Center training campus in Dania Beach — one of the largest US STCW training campuses.

• Associated Marine Officers' and Seamen's Union of the PhilippinesAMOSUP · Philippines · founded 1960

  Largest single seafarer union in the world by membership. Represents Filipino officers, ratings, and cadets on foreign-flag vessels via AMOSUP-signed ITF or IBF CBAs. Operates the Seafarers' Hospital in Cavite City, three seafarer training schools in Manila and Iloilo, and a pension + wage-recovery scheme for members.

• Australian Maritime Officers' UnionAMOU · Australia · founded 1988

  Officer-only counterpart to the MUA. Negotiates CBAs for licensed masters, deck officers, engineers, and integrated ratings on Australian-flag deep-sea + coastal + offshore-oil-and-gas fleets. Long-standing ITF affiliate.

• China Seamen's UnionChina Seamen's Union · China · founded 1921

  Under All-China Federation of Trade Unions (ACFTU) umbrella. Coordinates Chinese seafarer welfare + wage-schedule frameworks with Chinese shipping companies + Chinese Ministry of Transport. Rare among ITF affiliates in operating under a state-supervised union framework.

• Croatian Seafarers' UnionSPH · Croatia · founded 1990

  Primary Croatian seafarer union + ITF affiliate. Represents Croatian officers + ratings on Croatian-flag + foreign-flag vessels; historically strong on tanker + product-tanker + coastal-Mediterranean trades.

• Federation of Korean Maritime UnionsFKMU · South Korea · founded 1961

  Umbrella federation of Korean maritime + shipbuilding trade unions. Coordinates advocacy with Korean government + shipbuilding conglomerates. Represents Korean seafarers on Korean-flag + Korean-controlled tonnage internationally.

• International Maritime Employers' CouncilIMEC · United Kingdom · founded 1965

  Employer counterpart to the ITF in the International Bargaining Forum (IBF). Negotiates the IBF Framework Agreement — the industry-standard CBA covering ~14,000 vessels manned by IMEC-member operators. Sets the IBF Total Crew Cost (TCC) benchmark, which is the employer-side counterpart to the ITF Uniform TCC.

• International Transport Workers' FederationITF · United Kingdom · founded 1896

  Parent global federation. Runs the ITF Flags of Convenience campaign, sets the ITF Uniform TCC (Total Crew Cost) benchmark that many FoC-vessel CBAs anchor to, and deploys inspectors in ~100 ports worldwide to enforce ITF-signed CBAs on FoC vessels.

• Marine Engineers' Beneficial AssociationMEBA · United States · founded 1875

  Primary US union for licensed marine engineers on US-flag deep-sea, Great Lakes, and inland waterways vessels. Negotiates CBAs with US-flag operators including Matson, Crowley, Hapag-Lloyd USA, Grand Bahama Shipyard, and the Military Sealift Command civilian mariner fleet. Also runs the Calhoun MEBA Engineering School in Baltimore — a licensed STCW training centre offering upgrades to USCG competencies.

• Marine Transport Workers' Trade Union of UkraineMTWTU · Ukraine · founded 1992

  Primary Ukrainian seafarer union + ITF affiliate. Coordinates repatriation + wage advocacy for Ukrainian seafarers on foreign-flag vessels. Since February 2022 Russian invasion has had an outsized role coordinating extraordinary repatriation cases + emergency support for Ukrainian crews unable to return home.

• Maritime Union of AustraliaMUA · Australia · founded 1993

  Primary Australian union for seafarers, waterside workers, and offshore-oil-and-gas workers. Historically militant + politically active; the 1998 Australian waterfront dispute (Patrick Corporation lockout) is the touchstone modern industrial-relations case in Australian shipping. Negotiates CBAs with Australian-flag operators + offshore-industry contractors.

• Maritime Union of New ZealandMUNZ · New Zealand · founded 2002

  Primary maritime industrial union for New Zealand, formed by the 2002 merger of the NZ Seafarers' Union and the Waterfront Workers' Union. Represents port workers, coastal shipping, ferry, and offshore-support-vessel crew. Runs regular disputes with the Ports of Auckland Ltd and the Cook Strait ferry operators over rostering, safe manning, and casualisation.

• National Union of Seafarers of IndiaNUSI · India · founded 1950

  Primary Indian seafarer union. ITF affiliate and IBF signatory. Represents Indian seafarers on foreign-flag vessels through employment contracts negotiated with DG Shipping-licensed RPSL manning agencies. Operates the NUSI Maritime Academy in Goa (STCW training) and a substantial welfare fund for members.

• Nautilus InternationalNautilus · United Kingdom · founded 2009

  Professional and industrial union for maritime officers in the UK, Netherlands, and Swiss inland shipping. Formed by the 2009 merger of NUMAST (UK) with Nautilus NL. Negotiates British Merchant Navy CBAs, Dutch KVNR agreements, and Swiss inland-shipping CBAs; runs a substantial legal-support arm for members facing manning-agency disputes, incident inquiries, and pension issues.

• Norwegian Seafarers' UnionNorsk Sjømannsforbund · Norway · founded 1910

  Primary Norwegian seafarer union. Negotiates CBAs covering Norwegian International Ship Register (NIS) vessels and Norwegian Ordinary Register (NOR) vessels — the two-tier registration system that lets Norwegian owners choose between NIS (foreign-crewed, competitive-labour-market conditions) and NOR (Norwegian-crewed, full domestic terms). Also negotiates offshore-vessel CBAs covering the North Sea offshore support fleet.

• Seafarers International Union of North AmericaSIU · United States · founded 1938

  Primary US union for unlicensed seafarers (ratings, ABs, oilers, wipers, stewards). Negotiates CBAs with US-flag deep-sea operators — Maersk Line Limited, Overseas Shipholding Group, TOTE Maritime, Crowley — plus the MSC civilian mariner fleet unlicensed positions. Operates the Paul Hall Center for Maritime Training and Education in Piney Point, Maryland — one of the largest US STCW training campuses.

• SNAOMTMFF BrazilSNAOMTMFF · Brazil · founded 1988

  Primary Brazilian seafarer + port + offshore union + ITF affiliate. Extensive engagement with Petrobras + Brazilian offshore-industry contractors (Modec, SBM, Bourbon, Solstad). Historically strong on Brazilian cabotage + AFRMM cabotage regulation advocacy.

• TDS (Türkiye Denizciler Sendikası)TDS · Turkey · founded 1946

  Primary Turkish seafarer union + ITF affiliate. Represents Turkish officers + ratings on Turkish-flag + foreign-flag vessels; historically strong on tanker + product-tanker + Bosphorus + Black Sea trades.