Abstract The case law on witness preparation at the International Criminal Court (ICC) does not provide a coherent answer to whether it is admissible. Similarly, scholars have examined this practice from different perspectives, but they have not come to a consensus, and no academic study focuses on the link between witness preparation and witnesses’ well-being. This article analyses ICC case law on this issue and identifies three different approaches to witness preparation. It suggests that witness preparation corresponds to a legal obligation under Article 68 of the Rome Statute to protect witnesses’ well-being. Additionally, Article 68 imposes an obligation to ensure witnesses are adequately prepared upon the entire ICC and not only its judges. This article recommends that the ICC should hold a broad consultation on witness preparation with different actors. Finally, given that the practice has the potential to be abused, this article provides some suggestions on how to balance witness preparation with the right to a fair trial and witnesses’ rights.