diff --git a/changelogs/fragments/9963-proxmox_disk-storage.yml b/changelogs/fragments/9963-proxmox_disk-storage.yml
new file mode 100644
index 0000000000..a93fb7d022
--- /dev/null
+++ b/changelogs/fragments/9963-proxmox_disk-storage.yml
@@ -0,0 +1,2 @@
+bugfixes:
+  - "proxmox_disk - fail gracefully if ``storage`` is required but not provided by the user (https://github.com/ansible-collections/community.general/issues/9941, https://github.com/ansible-collections/community.general/pull/9963)."
diff --git a/plugins/modules/proxmox_disk.py b/plugins/modules/proxmox_disk.py
index ed67445b30..3a49a2f58a 100644
--- a/plugins/modules/proxmox_disk.py
+++ b/plugins/modules/proxmox_disk.py
@@ -567,6 +567,8 @@ class ProxmoxDiskAnsible(ProxmoxAnsible):
                 ok_str = "CD-ROM was created on %s bus in VM %s"
             else:
                 config_str = self.module.params["storage"]
+                if not config_str:
+                    self.module.fail_json(msg="The storage option must be specified.")
                 if self.module.params.get("media") != "cdrom":
                     config_str += ":%s" % (self.module.params["size"])
                 ok_str = "Disk %s created in VM %s"