Provided are computer program product, system, and method for loading dependency library files from a shared library repository in an application runtime environment. A determination is made of a dependency tree of dependency library files for an application to load into an application runtime environment. A determination is made as to whether a shared library repository includes all the dependency library files in the dependency tree. The shared library repository is updated to include any dependency library files not in the dependency tree of the application. Access is provided to the dependency library files in the shared library repository in the dependency tree in the application runtime environment. The application is started in the application runtime environment in response to providing access to the dependency library files in the application runtime environment.
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