diff --git a/docs/resources/virtual_environment_vm.md b/docs/resources/virtual_environment_vm.md
index fe97263e..78df8c1e 100755
--- a/docs/resources/virtual_environment_vm.md
+++ b/docs/resources/virtual_environment_vm.md
@@ -414,7 +414,7 @@ output "ubuntu_vm_public_key" {
 - `kvm_arguments` - (Optional) Arbitrary arguments passed to kvm.
 - `machine` - (Optional) The VM machine type (defaults to `pc`).
     - `pc` - Standard PC (i440FX + PIIX, 1996).
-    - `q35` - Standard PC (Q35 + ICH9, 2009).
+    - `q35` - Standard PC (Q35 + ICH9, 2009). Optionally, you can enable VIOMMU by adding `viommu=virtio|intel` to the value, for example `q35,viommu=virtio`.
 - `memory` - (Optional) The memory configuration.
     - `dedicated` - (Optional) The dedicated memory in megabytes (defaults to `512`).
     - `floating` - (Optional) The floating memory in megabytes. The default is `0`, which disables "ballooning device" for the VM.
diff --git a/proxmoxtf/resource/vm/validators.go b/proxmoxtf/resource/vm/validators.go
index 9df032c5..d610403a 100755
--- a/proxmoxtf/resource/vm/validators.go
+++ b/proxmoxtf/resource/vm/validators.go
@@ -192,7 +192,7 @@ func KeyboardLayoutValidator() schema.SchemaValidateDiagFunc {
 // MachineTypeValidator is a schema validation function for machine types.
 func MachineTypeValidator() schema.SchemaValidateDiagFunc {
 	//nolint:lll
-	r := regexp.MustCompile(`^$|^(pc|pc(-i440fx)?-\d+(\.\d+)+(\+pve\d+)?(\.pxe)?|q35|pc-q35-\d+(\.\d+)+(\+pve\d+)?(\.pxe)?|virt(?:-\d+(\.\d+)+)?(\+pve\d+)?)$`)
+	r := regexp.MustCompile(`^$|^(pc|pc(-i440fx)?-\d+(\.\d+)+(\+pve\d+)?(\.pxe)?|q35(,viommu=(intel|virtio))?|pc-q35-\d+(\.\d+)+(\+pve\d+)?(\.pxe)?|virt(?:-\d+(\.\d+)+)?(\+pve\d+)?)$`)
 
 	return validation.ToDiagFunc(validation.StringMatch(r, "must be a valid machine type"))
 }
diff --git a/proxmoxtf/resource/vm/validators_test.go b/proxmoxtf/resource/vm/validators_test.go
index 28ea96e4..e971f7f4 100644
--- a/proxmoxtf/resource/vm/validators_test.go
+++ b/proxmoxtf/resource/vm/validators_test.go
@@ -54,6 +54,8 @@ func TestMachineType(t *testing.T) {
 		{"empty is valid", "", true},
 		{"invalid", "invalid", false},
 		{"valid q35", "q35", true},
+		{"valid q35 with viommu", "q35,viommu=virtio", true},
+		{"invalid q35 with viommu", "q35,viommu=invalid", false},
 		{"valid pc-q35", "pc-q35-2.3", true},
 		{"valid i440fx", "pc-i440fx-3.1+pve0", true},
 		{"valid virt", "virt", true},