Abstract: In one implementation, a system for policy based workload scaler includes a parameters engine to define external factors for a number of resources providing a number of cloud service workloads, a threshold engine to define a threshold value for the cloud service workloads from the number of resources, a priority engine to assign a priority to each of the number of cloud service workloads, and a service engine to reclaim resources from a first portion of cloud service workloads with a first priority and allocate the reclaimed resources to a second portion of cloud service workloads when the threshold value is exceeded and the external factors are exceeded.