Network interface provisioning of containerized instances based on tenant policies. A network interface assignment process (NIAP) receives a first request to assign a network interface to a first containerized instance comprising at least one container. The NIAP determines that a first tenant of a plurality of different tenants is associated with the first containerized instance. The NIAP accesses a first network assignment tenant policy (NATP) that corresponds to the first tenant. Based on the first NATP, the NIAP assigns, to the first containerized instance, a first network interface via which the first containerized instance can communicate with other containerized instances associated with the first tenant.