We currently don't support it out-of-the-box, but a community member is building a custom multi-tenant solution on top of Medusa essentially using the engine as building blocks.

Our architecture allows you to create custom entities, services and endpoints in your own Node.js project. Additionally, we use Avilix for dependency injection which allows you to use all services across all parts of the system; core, plugins, your custom project. In combination, you are provided with the primitives that can handle commerce business logic in almost any type of project.