Seafarers' Identity Documents Convention, 1958 is an International Labour Organization convention concerning Merchant Mariner's Document. It was established in 1958, with the preamble stating: "Having decided upon the adoption of certain proposals with regard to the reciprocal or international recognition of seafarers' national identity cards,..." An identity document issued under the convention or its successor is colloquially called a Seaman's Book or a Seaman's Card.

Modifications

The convention was subsequently revised in 2003 by Convention C185 Seafarers' Identity Documents Convention (Revised), 2003.

Ratifications

As of January 2023, the convention had been ratified by 64 states. Eleven of the ratifying states have automatically denounced the convention by their subsequent acceptance of conventions that trigger denunciation.