The CIM Convention, also known as the "Convention Internationale concernant le transport des Marchandises par chemin de fer," is an internationally standardized freight document used in rail transport. It has been in force since 1965 and serves as the legal basis for the conclusion of freight contracts in international rail goods transport using a single freight document.

The CIM Convention is designed to facilitate the smooth and efficient transportation of goods by rail across international borders. It sets out the terms and conditions for the transportation of goods by rail, including issues such as liability, insurance, and the handling of lost or damaged goods.

The CIM Convention is widely used in international rail transport and is recognized by most countries around the world. It is an important tool for ensuring the smooth and efficient movement of goods by rail, and helps to facilitate trade and economic growth.