Flags of convenience: the full list

Under international law a ship must have a nationality — it must fly the flag of a state, whose law governs it on the high seas. In principle there should be a "genuine link" between the ship and the flag. In practice, for most of the world fleet there is no such link at all: the vessel is owned in one country, managed in a second, crewed from a third and registered in a fourth chosen purely because it is cheap and undemanding. That fourth country's flag is a flag of convenience.

The term itself is not neutral. It was coined by the International Transport Workers' Federation (ITF), which maintains the canonical list and campaigns against the model on labour grounds. As of 2025 the ITF lists 48 countries as flags of convenience, a roster reviewed periodically by its Fair Practices Committee and revised as registries are added or dropped.

The biggest flags of convenience

By the number of vessels they carry, the FoC list is topped by a familiar set of open registries:

Rank	Flag of convenience
1	Panama
2	Marshall Islands
3	Liberia
4	Malta
5	Antigua & Barbuda

The remaining flags on the ITF's list of 48 range from substantial registries such as the Bahamas, Cyprus and Comoros down to small states whose merchant fleets exist mostly on paper. Note the overlap with the tonnage ranking: Liberia, Panama and the Marshall Islands are not only the largest flags of convenience, they are the three largest ship registries in the world full stop — which is why "FoC" describes most of global shipping rather than a fringe of it. For the corrected tonnage order, see the most common flag states.

Why owners use them

The appeal is straightforward, and largely legitimate:

• Cost — lower registration fees and annual tonnage tax than most traditional maritime nations.
• Tax — favourable or negligible corporate tax on shipping income.
• Crewing flexibility — freedom to hire crews from anywhere on local terms rather than under the owner's national labour law.
• Speed and ease — fast, online registration with minimal bureaucracy.

For a well-run owner, an open registry is simply efficient. The problem is that the same features — distance, low oversight, easy entry — also suit owners who would rather not be inspected too closely, which is where the criticism bites.

A flag of convenience is a choice, not a nationality. The question that matters is not which flag a ship flies, but what the rest of its record says. ITF Global, flags of convenience list, 2025

The downside the label points at

The ITF's concern is principally the seafarer: under a weak flag, crews can be underpaid, stranded or left without recourse, because the flag state that is supposed to protect them is absent. There is a safety dimension too — some, though by no means all, FoC registries cluster at the wrong end of port-state-control performance, and the worst-performing flags overlap with the very-high-risk band of the Paris MoU black list. And the model's anonymity is exactly what the shadow fleet exploits when it shops for an obscure flag to hide an old tanker behind.

None of that makes a flag of convenience a red flag in itself — it cannot, when most legitimate ships fly one. The flag is a single data point. It matters only in combination with the vessel's age, ownership, inspection history and sanctions standing.

Reading the flag in context

This is the case for reading a flag against the rest of the file rather than on its own, and for tying all of it to the one identifier a ship cannot swap, the IMO number. In the Marifest registry, every vessel record shows the current flag and notes whether it is an open registry, and the compliance screen matches the hull against the OFAC, EU, UN and UK lists. So you can see at a glance that a ship flies an FoC — and, far more usefully, see what its age, owner and screening verdict say alongside it. To understand what a flag state is responsible for in the first place, start with flag states explained.