diff --git a/homeassistant/components/proxmoxve/button.py b/homeassistant/components/proxmoxve/button.py
index 7f596a5e5c57..b5422c97a4bc 100644
--- a/homeassistant/components/proxmoxve/button.py
+++ b/homeassistant/components/proxmoxve/button.py
@@ -378,7 +378,7 @@ class ProxmoxVMButtonEntity(ProxmoxVMEntity, ProxmoxBaseButton):
             self.entity_description.press_action,
             self.coordinator,
             self._node_name,
-            self.vm_data["vmid"],
+            self.device_id,
         )
 
 
@@ -394,5 +394,5 @@ class ProxmoxContainerButtonEntity(ProxmoxContainerEntity, ProxmoxBaseButton):
             self.entity_description.press_action,
             self.coordinator,
             self._node_name,
-            self.container_data["vmid"],
+            self.device_id,
         )
diff --git a/homeassistant/components/proxmoxve/config_flow.py b/homeassistant/components/proxmoxve/config_flow.py
index 14c4086f6a61..6a1a91b7fb20 100644
--- a/homeassistant/components/proxmoxve/config_flow.py
+++ b/homeassistant/components/proxmoxve/config_flow.py
@@ -161,8 +161,8 @@ def _get_nodes_data(data: dict[str, Any]) -> list[dict[str, Any]]:
         nodes_data.append(
             {
                 CONF_NODE: node["node"],
-                CONF_VMS: [vm["vmid"] for vm in vms],
-                CONF_CONTAINERS: [container["vmid"] for container in containers],
+                CONF_VMS: [int(vm["vmid"]) for vm in vms],
+                CONF_CONTAINERS: [int(container["vmid"]) for container in containers],
             }
         )
 
diff --git a/homeassistant/components/proxmoxve/entity.py b/homeassistant/components/proxmoxve/entity.py
index ec852040e305..2c9d80ec9255 100644
--- a/homeassistant/components/proxmoxve/entity.py
+++ b/homeassistant/components/proxmoxve/entity.py
@@ -129,7 +129,7 @@ class ProxmoxVMEntity(ProxmoxCoordinatorEntity):
         self.entity_description = entity_description
         self._vm_data = vm_data
         self._node_name = node_data.node["node"]
-        self.device_id = vm_data["vmid"]
+        self.device_id = int(vm_data["vmid"])
         self.device_name = vm_data["name"]
 
         self._attr_device_info = DeviceInfo(
@@ -187,7 +187,8 @@ class ProxmoxContainerEntity(ProxmoxCoordinatorEntity):
         self.entity_description = entity_description
         self._container_data = container_data
         self._node_name = node_data.node["node"]
-        self.device_id = container_data["vmid"]
+        # Proxmox hands out a container vmid as a string, a VM one as an int
+        self.device_id = int(container_data["vmid"])
         self.device_name = container_data["name"]
 
         self._attr_device_info = DeviceInfo(
diff --git a/tests/components/proxmoxve/conftest.py b/tests/components/proxmoxve/conftest.py
index 598cc9c75b50..66e5209ccddc 100644
--- a/tests/components/proxmoxve/conftest.py
+++ b/tests/components/proxmoxve/conftest.py
@@ -133,8 +133,8 @@ def mock_proxmox_client():
             else load_json_array_fixture("nodes/tasks.json", DOMAIN)
         )
 
-        qemu_by_vmid = {vm["vmid"]: vm for vm in qemu_list}
-        lxc_by_vmid = {vm["vmid"]: vm for vm in lxc_list}
+        qemu_by_vmid = {int(vm["vmid"]): vm for vm in qemu_list}
+        lxc_by_vmid = {int(vm["vmid"]): vm for vm in lxc_list}
 
         # Cache resource mocks by vmid so callers (e.g. button tests) can
         # inspect specific call counts after pressing a button.
diff --git a/tests/components/proxmoxve/fixtures/nodes/lxc.json b/tests/components/proxmoxve/fixtures/nodes/lxc.json
index a5aec293a655..06f86d427288 100644
--- a/tests/components/proxmoxve/fixtures/nodes/lxc.json
+++ b/tests/components/proxmoxve/fixtures/nodes/lxc.json
@@ -1,6 +1,6 @@
 [
   {
-    "vmid": 200,
+    "vmid": "200",
     "name": "ct-nginx",
     "status": "running",
     "maxmem": 1073741824,
@@ -14,7 +14,7 @@
     "netout": 524288
   },
   {
-    "vmid": 201,
+    "vmid": "201",
     "name": "ct-backup",
     "status": "stopped",
     "maxmem": 1073741824,
diff --git a/tests/components/proxmoxve/snapshots/test_diagnostics.ambr b/tests/components/proxmoxve/snapshots/test_diagnostics.ambr
index 188211cc2a33..b14f3294e236 100644
--- a/tests/components/proxmoxve/snapshots/test_diagnostics.ambr
+++ b/tests/components/proxmoxve/snapshots/test_diagnostics.ambr
@@ -71,7 +71,7 @@
             'netout': 524288,
             'status': 'running',
             'uptime': 43200,
-            'vmid': 200,
+            'vmid': '200',
           }),
           '201': dict({
             'cpu': 0.05,
@@ -85,7 +85,7 @@
             'netout': 524288,
             'status': 'stopped',
             'uptime': 43200,
-            'vmid': 201,
+            'vmid': '201',
           }),
         }),
         'node': dict({