Preventing the misuse of personally identifiable information and preserving user privacy are key issues in the management of IT services, especially when organizational borders are crossed. In this paper, we first present an analysis of the differences between Grid environments and previous models of inter-organizational collaboration. Based on requirements derived thereof, we demonstrate how existing policy-based privacy management architectures can be extended to provide Grid-specific functionality and can be integrated into existing infrastructures. Special emphasis is put on privacy policies which can be configured by users themselves, and distinguishing between the initial data access and the later data usage control phases. We also discuss the application of this approach to a XACML-based privacy management system.