diff --git a/example/resource_virtual_environment_vm.tf b/example/resource_virtual_environment_vm.tf
index 68c27cee..322ad8e4 100644
--- a/example/resource_virtual_environment_vm.tf
+++ b/example/resource_virtual_environment_vm.tf
@@ -9,12 +9,14 @@ resource "proxmox_virtual_environment_vm" "example_template" {
     datastore_id = element(data.proxmox_virtual_environment_datastores.example.datastore_ids, index(data.proxmox_virtual_environment_datastores.example.datastore_ids, "local-lvm"))
     file_id      = proxmox_virtual_environment_file.ubuntu_cloud_image.id
     interface    = "scsi0"
+    discard      = "on"
     iothread     = true
   }
 
 #  disk {
 #    datastore_id = "nfs"
 #    interface    = "scsi1"
+#    discard      = "ignore"
 #    iothread     = true
 #  }
 
diff --git a/proxmox/virtual_environment_vm_types.go b/proxmox/virtual_environment_vm_types.go
index 0c0255ed..435281b9 100644
--- a/proxmox/virtual_environment_vm_types.go
+++ b/proxmox/virtual_environment_vm_types.go
@@ -156,14 +156,15 @@ type CustomStorageDevice struct {
 	BackupEnabled           *CustomBool `json:"backup,omitempty" url:"backup,omitempty,int"`
 	BurstableReadSpeedMbps  *int        `json:"mbps_rd_max,omitempty" url:"mbps_rd_max,omitempty"`
 	BurstableWriteSpeedMbps *int        `json:"mbps_wr_max,omitempty" url:"mbps_wr_max,omitempty"`
+	Discard                 *string     `json:"discard,omitempty" url:"discard,omitempty"`
 	Enabled                 bool        `json:"-" url:"-"`
 	FileVolume              string      `json:"file" url:"file"`
+	Format                  *string     `json:"format,omitempty" url:"format,omitempty"`
+	IOThread                *CustomBool `json:"iothread,omitempty" url:"iothread,omitempty,int"`
 	MaxReadSpeedMbps        *int        `json:"mbps_rd,omitempty" url:"mbps_rd,omitempty"`
 	MaxWriteSpeedMbps       *int        `json:"mbps_wr,omitempty" url:"mbps_wr,omitempty"`
 	Media                   *string     `json:"media,omitempty" url:"media,omitempty"`
 	Size                    *string     `json:"size,omitempty" url:"size,omitempty"`
-	Format                  *string     `json:"format,omitempty" url:"format,omitempty"`
-	IOThread                *CustomBool `json:"iothread,omitempty" url:"iothread,omitempty,int"`
 	Interface               *string
 	ID                      *string
 	FileID                  *string
@@ -1068,6 +1069,10 @@ func (r CustomStorageDevice) EncodeValues(key string, v *url.Values) error {
 		}
 	}
 
+	if r.Discard != nil && *r.Discard != "" {
+		values = append(values, fmt.Sprintf("discard=%s", *r.Discard))
+	}
+
 	v.Add(key, strings.Join(values, ","))
 
 	return nil
@@ -1600,6 +1605,8 @@ func (r *CustomStorageDevice) UnmarshalJSON(b []byte) error {
 			case "iothread":
 				bv := CustomBool(v[1] == "1")
 				r.IOThread = &bv
+			case "discard":
+				r.Discard = &v[1]
 			}
 		}
 	}
diff --git a/proxmoxtf/resource_virtual_environment_vm.go b/proxmoxtf/resource_virtual_environment_vm.go
index 280406e6..5578704e 100644
--- a/proxmoxtf/resource_virtual_environment_vm.go
+++ b/proxmoxtf/resource_virtual_environment_vm.go
@@ -51,6 +51,7 @@ const (
 	dvResourceVirtualEnvironmentVMDiskFileID                        = ""
 	dvResourceVirtualEnvironmentVMDiskSize                          = 8
 	dvResourceVirtualEnvironmentVMDiskIOThread                      = false
+	dvResourceVirtualEnvironmentVMDiskDiscard                       = ""
 	dvResourceVirtualEnvironmentVMDiskSpeedRead                     = 0
 	dvResourceVirtualEnvironmentVMDiskSpeedReadBurstable            = 0
 	dvResourceVirtualEnvironmentVMDiskSpeedWrite                    = 0
@@ -135,6 +136,7 @@ const (
 	mkResourceVirtualEnvironmentVMDiskFileID                        = "file_id"
 	mkResourceVirtualEnvironmentVMDiskSize                          = "size"
 	mkResourceVirtualEnvironmentVMDiskIOThread                      = "iothread"
+	mkResourceVirtualEnvironmentVMDiskDiscard                       = "discard"
 	mkResourceVirtualEnvironmentVMDiskSpeed                         = "speed"
 	mkResourceVirtualEnvironmentVMDiskSpeedRead                     = "read"
 	mkResourceVirtualEnvironmentVMDiskSpeedReadBurstable            = "read_burstable"
@@ -482,6 +484,7 @@ func resourceVirtualEnvironmentVM() *schema.Resource {
 							mkResourceVirtualEnvironmentVMDiskInterface:   dvResourceVirtualEnvironmentVMDiskInterface,
 							mkResourceVirtualEnvironmentVMDiskSize:        dvResourceVirtualEnvironmentVMDiskSize,
 							mkResourceVirtualEnvironmentVMDiskIOThread:    dvResourceVirtualEnvironmentVMDiskIOThread,
+							mkResourceVirtualEnvironmentVMDiskDiscard:     dvResourceVirtualEnvironmentVMDiskDiscard,
 						},
 					}, nil
 				},
@@ -527,6 +530,12 @@ func resourceVirtualEnvironmentVM() *schema.Resource {
 							Optional:    true,
 							Default:     dvResourceVirtualEnvironmentVMDiskIOThread,
 						},
+						mkResourceVirtualEnvironmentVMDiskDiscard: {
+							Type:        schema.TypeString,
+							Description: "Whether to pass discard/trim requests to the underlying storage.",
+							Optional:    true,
+							Default:     dvResourceVirtualEnvironmentVMDiskDiscard,
+						},
 						mkResourceVirtualEnvironmentVMDiskSpeed: {
 							Type:        schema.TypeList,
 							Description: "The speed limits",
@@ -1805,6 +1814,7 @@ func resourceVirtualEnvironmentVMCreateCustomDisks(ctx context.Context, d *schem
 		speed := block[mkResourceVirtualEnvironmentVMDiskSpeed].([]interface{})
 		diskInterface, _ := block[mkResourceVirtualEnvironmentVMDiskInterface].(string)
 		ioThread := proxmox.CustomBool(block[mkResourceVirtualEnvironmentVMDiskIOThread].(bool))
+		discard, _ := block[mkResourceVirtualEnvironmentVMDiskDiscard].(string)
 
 		if len(speed) == 0 {
 			diskSpeedDefault, err := diskSpeedResource.DefaultValue()
@@ -1826,6 +1836,10 @@ func resourceVirtualEnvironmentVMCreateCustomDisks(ctx context.Context, d *schem
 			diskOptions += ",iothread=1"
 		}
 
+		if discard != "" {
+			diskOptions += fmt.Sprintf(",discard=%s", discard)
+		}
+
 		if speedLimitRead > 0 {
 			diskOptions += fmt.Sprintf(",mbps_rd=%d", speedLimitRead)
 		}
@@ -2110,6 +2124,7 @@ func resourceVirtualEnvironmentVMGetDiskDeviceObjects(d *schema.ResourceData, di
 		size, _ := block[mkResourceVirtualEnvironmentVMDiskSize].(int)
 		diskInterface, _ := block[mkResourceVirtualEnvironmentVMDiskInterface].(string)
 		ioThread := proxmox.CustomBool(block[mkResourceVirtualEnvironmentVMDiskIOThread].(bool))
+		discard := block[mkResourceVirtualEnvironmentVMDiskDiscard].(string)
 
 		speedBlock, err := getSchemaBlock(resource, d, []string{mkResourceVirtualEnvironmentVMDisk, mkResourceVirtualEnvironmentVMDiskSpeed}, 0, false)
 
@@ -2130,6 +2145,7 @@ func resourceVirtualEnvironmentVMGetDiskDeviceObjects(d *schema.ResourceData, di
 		diskDevice.Size = &sizeString
 		diskDevice.SizeInt = &size
 		diskDevice.IOThread = &ioThread
+		diskDevice.Discard = &discard
 
 		if len(speedBlock) > 0 {
 			speedLimitRead := speedBlock[mkResourceVirtualEnvironmentVMDiskSpeedRead].(int)
@@ -2637,6 +2653,12 @@ func resourceVirtualEnvironmentVMReadCustom(ctx context.Context, d *schema.Resou
 			disk[mkResourceVirtualEnvironmentVMDiskIOThread] = false
 		}
 
+		if dd.Discard != nil {
+			disk[mkResourceVirtualEnvironmentVMDiskDiscard] = *dd.Discard
+		} else {
+			disk[mkResourceVirtualEnvironmentVMDiskDiscard] = ""
+		}
+
 		diskMap[di] = disk
 	}