A client-isolation internal/external fabric LCS provisioning system includes an orchestrator device coupled to a client device via an external fabric, and coupled to resource devices via an internal fabric that is not accessible to the client device via the external fabric. The orchestrator device configures the resource devices to communicate with each other in a manner that satisfies a workload intent for a workload requested by the client device, and presents an LCS provided using the configured resource devices to the client device via the external fabric. When the orchestrator device receives LCS communication(s) directed to the LCS from the client device via the external fabric, it provides instruction(s) to at least one of the resource devices via the internal fabric that are based on the LCS communication and that are configured to cause the at least one of the resource devices to perform function(s) for the LCS.