Systems and methods for network function virtualization (NFV) resource management are disclosed that include receiving, by a network functions virtualization orchestrator (NFVO), a reuse requirement for a first network service (NS) and determining, by the NFVO, that at least one constituent virtual network function (VNF) instance in the first NS is retainable for reuse in a second NS according to the reuse requirement when the first NS is to be terminated. In some embodiments, these systems and methods also include retaining, by the NFVO, the at least one constituent VNF instance in the first NS for reuse in the second NS.