Pooling public cloud resources from different subscriptions using reservations

An example method of managing virtualized computing resources provided by a public cloud includes: grouping subscriptions in the public cloud into reservations, each of the reservations including constraints on virtualized computing resources provided by at least one of the subscriptions; allocating the reservations among a plurality of principals; receiving a request to provision a workload from a user associated with a first principal of the plurality of principals, wherein the workload includes metadata describing constraints of the workload; generating a deployment plan for the workload based on the metadata therein and at least one of the reservations allocated to the first principal, the deployment plan specifying a first subscription of the subscriptions; and transmitting a deployment.