diff --git a/pkg/harvester/config/labels-annotations.js b/pkg/harvester/config/labels-annotations.js
index 3d24ea15..fd90c2bd 100644
--- a/pkg/harvester/config/labels-annotations.js
+++ b/pkg/harvester/config/labels-annotations.js
@@ -83,4 +83,5 @@ export const HCI = {
   NODE_UPGRADE_PAUSE_MAP:           'harvesterhci.io/node-upgrade-pause-map',
   CDI_POPULATOR_KIND:               'cdi.kubevirt.io/storage.populator.kind',
   CNI_NETWORKS:                     'k8s.v1.cni.cncf.io/networks',
+  WINDOWS_SYSPREP:                  'harvesterhci.io/windows-sysprep',
 };
diff --git a/pkg/harvester/edit/kubevirt.io.virtualmachine/VirtualMachineWindowsSysprep/index.vue b/pkg/harvester/edit/kubevirt.io.virtualmachine/VirtualMachineWindowsSysprep/index.vue
new file mode 100644
index 00000000..6783bba2
--- /dev/null
+++ b/pkg/harvester/edit/kubevirt.io.virtualmachine/VirtualMachineWindowsSysprep/index.vue
@@ -0,0 +1,346 @@
+<script>
+import { mapGetters } from 'vuex';
+import { Banner } from '@components/Banner';
+import { LabeledInput } from '@components/Form/LabeledInput';
+import LabeledSelect from '@shell/components/form/LabeledSelect';
+import YamlEditor, { EDITOR_MODES } from '@shell/components/YamlEditor';
+import ModalWithCard from '@shell/components/ModalWithCard';
+import { SECRET } from '@shell/config/types';
+
+const _AUTOUNATTENDXML = 'autounattend.xml';
+const _NEW = '_NEW';
+
+export default {
+  name: 'VirtualMachineWindowsSysprep',
+
+  components: {
+    Banner,
+    LabeledInput,
+    LabeledSelect,
+    ModalWithCard,
+    YamlEditor,
+  },
+
+  props: {
+    mode: {
+      type:    String,
+      default: 'create',
+    },
+    namespace: {
+      type:     String,
+      required: true,
+    },
+    value: {
+      type:    Object,
+      default: () => ({
+        secretName: '',
+        xmlContent: '',
+      }),
+    },
+  },
+
+  data() {
+    return {
+      secretOptions:  [],
+      errors:         [],
+      secretName:     '',
+      xmlContent:     '',
+      newSecretName:  '',
+      newXmlContent:  '',
+      isOpen:         false,
+    };
+  },
+
+  async fetch() {
+    await this.loadSecretsOptions();
+  },
+
+  mounted() {
+    // Force the loading of the XML content.
+    this.secretName = this.value?.secretName || '';
+  },
+
+  watch: {
+    secretName() {
+      if (this.secretName === _NEW) {
+        this.isOpen = true;
+
+        return;
+      }
+
+      // Load the content from the given secret, or set empty value.
+      this.xmlContent = this.secretName === '' ? '' : this.loadXmlContentFromSecret(this.secretName);
+
+      // Update the editor form field.
+      this.updateValue();
+
+      // Update the property.
+      this.update();
+    },
+
+    xmlContent() {
+      this.update();
+    }
+  },
+
+  computed: {
+    ...mapGetters({ t: 'i18n/t' }),
+
+    editorMode() {
+      return this.mode === 'view' ? EDITOR_MODES.VIEW_CODE : EDITOR_MODES.EDIT_CODE;
+    },
+
+    isView() {
+      return this.mode === 'view';
+    },
+
+    xmlContentValidationError() {
+      return this.validateXmlContent(this.xmlContent);
+    },
+  },
+
+  methods: {
+    update() {
+      this.$emit('update:value', {
+        secretName: this.secretName,
+        xmlContent: this.xmlContent,
+      });
+    },
+
+    updateValue() {
+      this.$refs?.xmlEditor?.updateValue?.(this.xmlContent);
+    },
+
+    refresh() {
+      this.$refs?.xmlEditor?.refresh?.();
+    },
+
+    cancel() {
+      if (this.secretName === _NEW) {
+        this.secretName = '';
+      }
+      this.newSecretName = '';
+      this.newXmlContent = '';
+      this.errors = [];
+      this.isOpen = false;
+    },
+
+    async loadSecretsOptions() {
+      const secrets = await this.$store.dispatch('harvester/findAll', { type: SECRET });
+
+      const templates = secrets
+        .filter(
+          (s) => s.metadata?.namespace === this.namespace &&
+            s.decodedData?.[_AUTOUNATTENDXML]
+        )
+        .map((s) => ({
+          label: s.metadata.name,
+          value: `${ s.metadata.namespace }/${ s.metadata.name }`,
+        }));
+
+      this.secretOptions = [
+        {
+          label: this.t('generic.none'),
+          value: '',
+        },
+        {
+          label: this.t('harvester.virtualMachine.sysprep.createNew'),
+          value: _NEW,
+        },
+        ...templates,
+      ];
+    },
+
+    async save(buttonCb) {
+      this.errors = [];
+
+      if (!this.newSecretName?.trim()) {
+        this.errors.push(this.t('validation.required', { key: this.t('harvester.virtualMachine.input.name') }, true));
+        buttonCb(false);
+
+        return;
+      }
+
+      if (!this.newXmlContent?.trim()) {
+        this.errors.push(this.t('validation.required', { key: this.t('harvester.virtualMachine.sysprep.xmlContent') }, true));
+        buttonCb(false);
+
+        return;
+      }
+
+      const xmlError = this.validateXmlContent(this.newXmlContent);
+
+      if (xmlError) {
+        this.errors.push(xmlError);
+        buttonCb(false);
+
+        return;
+      }
+
+      try {
+        const secret = await this.$store.dispatch('harvester/create', {
+          type:     SECRET,
+          metadata: {
+            name:      this.newSecretName,
+            namespace: this.namespace,
+          },
+        });
+
+        secret.setData(_AUTOUNATTENDXML, this.newXmlContent);
+        const res = await secret.save();
+
+        if (res?.metadata?.name) {
+          await this.loadSecretsOptions();
+          this.secretName = `${ this.namespace }/${ res.metadata.name }`;
+        }
+
+        buttonCb(true);
+        this.cancel();
+      } catch (err) {
+        this.errors = [err.message];
+        buttonCb(false);
+      }
+    },
+
+    validateXmlContent(content) {
+      if (!content?.trim()) {
+        return null;
+      }
+
+      try {
+        const parser = new DOMParser();
+        const doc = parser.parseFromString(content, 'text/xml');
+        const parseError = doc.querySelector('parsererror');
+
+        if (parseError) {
+          return this.t('harvester.virtualMachine.sysprep.validation.invalidXml');
+        }
+
+        // See https://learn.microsoft.com/en-us/windows-hardware/drivers/gpiobtn/implement-the-unattended-windows-setup-setting
+        if (doc.documentElement.namespaceURI !== 'urn:schemas-microsoft-com:unattend') {
+          return this.t('harvester.virtualMachine.sysprep.validation.invalidNamespace');
+        }
+
+        return null;
+      } catch (e) {
+        return e.message;
+      }
+    },
+
+    loadXmlContentFromSecret(id) {
+      const secret = this.$store.getters['harvester/byId'](SECRET, id);
+
+      return secret?.decodedData?.[_AUTOUNATTENDXML] || '';
+    }
+  },
+};
+</script>
+
+<template>
+  <div>
+    <h2 v-if="!isView">
+      {{ t('harvester.virtualMachine.sysprep.title') }}
+    </h2>
+    <p
+      v-if="!isView"
+      class="text-muted mb-20"
+    >
+      <t
+        k="harvester.virtualMachine.sysprep.description"
+        :raw="true"
+      />
+    </p>
+
+    <!-- Secret Selection -->
+    <div class="row mb-20">
+      <div class="col span-12">
+        <LabeledSelect
+          v-model:value="secretName"
+          :options="secretOptions"
+          :label="t('harvester.virtualMachine.sysprep.secret.label')"
+          :mode="mode"
+        />
+      </div>
+    </div>
+
+    <!-- XML Editor -->
+    <div class="mb-20">
+      <Banner
+        v-if="xmlContentValidationError"
+        color="error"
+        class="mb-10"
+      >
+        <i class="icon icon-error" />
+        {{ xmlContentValidationError }}
+      </Banner>
+
+      <div class="resource-xml">
+        <YamlEditor
+          ref="xmlEditor"
+          v-model:value="xmlContent"
+          :editor-mode="editorMode"
+          class="xml-editor"
+        />
+      </div>
+    </div>
+
+    <ModalWithCard
+      v-if="isOpen"
+      name="createSysprepSecret"
+      width="40%"
+      :errors="errors"
+      @finish="save"
+      @close="cancel"
+    >
+      <template #title>
+        {{ t('harvester.virtualMachine.sysprep.createNewTitle') }}
+      </template>
+
+      <template #content>
+        <LabeledInput
+          v-model:value="newSecretName"
+          :label="t('harvester.virtualMachine.input.name')"
+          class="mb-20"
+          required
+          @keydown.native.enter.prevent="()=>{}"
+        />
+
+        <div class="xml">
+          <div class="resource-xml">
+            <YamlEditor
+              ref="createTemplate"
+              v-model:value="newXmlContent"
+              :editor-mode="editorMode"
+              class="xml-editor"
+            />
+          </div>
+        </div>
+      </template>
+    </ModalWithCard>
+  </div>
+</template>
+
+<style lang="scss" scoped>
+$xml-height: 350px;
+
+:deep() .resource-xml {
+  flex: 1;
+  display: flex;
+  flex-direction: column;
+
+  & .xml-editor {
+    flex: 1;
+    min-height: $xml-height;
+    font-family: monospace;
+
+    & .code-mirror .CodeMirror {
+      min-height: $xml-height;
+    }
+  }
+}
+
+.xml {
+  height: $xml-height;
+  overflow: auto;
+}
+</style>
diff --git a/pkg/harvester/edit/kubevirt.io.virtualmachine/index.vue b/pkg/harvester/edit/kubevirt.io.virtualmachine/index.vue
index 6100be83..b675a824 100644
--- a/pkg/harvester/edit/kubevirt.io.virtualmachine/index.vue
+++ b/pkg/harvester/edit/kubevirt.io.virtualmachine/index.vue
@@ -29,6 +29,7 @@ import RestartVMDialog from '../../dialog/RestartVMDialog';
 import PciDevices from './VirtualMachinePciDevices/index';
 import AccessCredentials from './VirtualMachineAccessCredentials';
 import CloudConfig from './VirtualMachineCloudConfig';
+import WindowsSysprep from './VirtualMachineWindowsSysprep';
 import CpuMemory from './VirtualMachineCpuMemory';
 import CpuModel from './VirtualMachineCpuModel';
 import Network from './VirtualMachineNetwork';
@@ -59,6 +60,7 @@ export default {
     CpuMemory,
     CpuModel,
     CloudConfig,
+    WindowsSysprep,
     NodeScheduling,
     PodAffinity,
     AccessCredentials,
@@ -324,6 +326,10 @@ export default {
       try {
         await this.saveSecret(res);
         await this.saveAccessCredentials(res);
+
+        if (this.isWindows) {
+          await this.saveSysprepConfig(res);
+        }
       } catch (e) {
         this.errors.push(...exceptionToErrorsArray(e));
       }
@@ -369,6 +375,7 @@ export default {
       clear(this.errors);
 
       this.validateCPUMemory();
+      this.validateWindowsSysprep();
 
       // block create VM flow if has validation errors
       if (this.errors.length) {
@@ -396,6 +403,24 @@ export default {
       }
     },
 
+    validateWindowsSysprep() {
+      if (!this.isWindows) {
+        return;
+      }
+
+      if (this.sysprep?.secretName?.trim?.() && !this.sysprep?.xmlContent?.trim?.()) {
+        this.errors.push(this.t('validation.required', { key: this.t('harvester.virtualMachine.sysprep.xmlContent') }, true));
+
+        return;
+      }
+
+      const sysprepValidationError = this.$refs.sysprepConfig?.xmlContentValidationError;
+
+      if (sysprepValidationError) {
+        this.errors.push(sysprepValidationError);
+      }
+    },
+
     async saveSingle(buttonCb) {
       this.parseVM();
       this.value.spec.template.spec.hostname = this.hostname ? this.hostname : this.value.metadata.name;
@@ -546,6 +571,7 @@ export default {
     onTabChanged({ tab }) {
       if (tab.name === 'advanced') {
         this.$refs.yamlEditor?.refresh();
+        this.$refs.sysprepConfig?.refresh();
       }
     },
 
@@ -1019,11 +1045,11 @@ export default {
         </div>
 
         <CloudConfig
+          v-if="!isWindows"
           ref="yamlEditor"
           :user-script="userScript"
           :mode="mode"
           :os-type="osType"
-          :view-code="isWindows"
           :namespace="value.metadata.namespace"
           :network-script="networkScript"
           @updateUserData="updateUserData"
@@ -1031,6 +1057,14 @@ export default {
           @updateDataTemplateId="updateDataTemplateId"
         />
 
+        <WindowsSysprep
+          v-if="isWindows"
+          ref="sysprepConfig"
+          v-model:value="sysprep"
+          :mode="mode"
+          :namespace="value.metadata.namespace"
+        />
+
         <Checkbox
           v-if="value.cpuPinningFeatureEnabled"
           v-model:value="cpuPinning"
diff --git a/pkg/harvester/l10n/en-us.yaml b/pkg/harvester/l10n/en-us.yaml
index 98f5a358..a3cd87f5 100644
--- a/pkg/harvester/l10n/en-us.yaml
+++ b/pkg/harvester/l10n/en-us.yaml
@@ -7,6 +7,7 @@ generic:
   inProgress: In Progress
   basic: Basic
   loading: Loading...
+  none: None
 
 unsupported:
   serverVersion: 'Current version: <code>{serverVersion}</code>'
@@ -797,6 +798,17 @@ harvester:
         label: Network Data Template
         title: "Network Data:"
         tip: "The network-data configuration allows you to customize the instance's networking interfaces by assigning subnet configuration, virtual device creation (bonds, bridges, VLANs) routes and DNS configuration. <a href='https://cloudinit.readthedocs.io/en/latest/reference/network-config-format-v1.html' target='_blank'>Learn more</a>"
+    sysprep:
+      title: Windows Sysprep Configuration
+      description: "Configure Windows automated installation using autounattend.xml. The configuration will be stored in a Kubernetes Secret and mounted as a CD-ROM during installation. <a href='https://docs.microsoft.com/en-us/windows-hardware/manufacture/desktop/automate-windows-setup' target='_blank'>Learn more</a>"
+      createNew: Create new...
+      createNewTitle: Create Windows Sysprep Template
+      xmlContent: autounattend.xml content
+      secret:
+        label: Windows Sysprep Template
+      validation:
+        invalidXml: Invalid XML syntax
+        invalidNamespace: Invalid unattend.xml namespace. Expected 'urn:schemas-microsoft-com:unattend'
     scheduling:
       affinity:
         anyNode: 'Run virtual machine on any available node'
diff --git a/pkg/harvester/mixins/harvester-vm/impl.js b/pkg/harvester/mixins/harvester-vm/impl.js
index b1d6df83..3c2ae101 100644
--- a/pkg/harvester/mixins/harvester-vm/impl.js
+++ b/pkg/harvester/mixins/harvester-vm/impl.js
@@ -255,6 +255,29 @@ export default {
       return this.convertToJson(userData)?.ssh_authorized_keys || [];
     },
 
+    getSysprepConfig(spec) {
+      const sysprepVolume = spec?.template?.spec?.volumes?.find(
+        (v) => v.name === 'sysprep' && v.sysprep?.secret
+      );
+
+      if (!sysprepVolume) {
+        return { secretName: '', xmlContent: '' };
+      }
+
+      const inStore = this.$store.getters['currentProduct'].inStore;
+      const namespace = this.value.metadata.namespace;
+      const secretName = sysprepVolume.sysprep.secret.name;
+      const secret = this.$store.getters[`${ inStore }/byId`](
+        SECRET,
+        `${ namespace }/${ secretName }`
+      );
+
+      return {
+        secretName: `${ namespace }/${ secretName }`,
+        xmlContent: secret?.decodedData?.['autounattend.xml'] || ''
+      };
+    },
+
     compareSSHValue(a = '', b = '') {
       const r = /(\r\n\t|\n|\r\t)|(\s*)/gm;
 
diff --git a/pkg/harvester/mixins/harvester-vm/index.js b/pkg/harvester/mixins/harvester-vm/index.js
index cfa5ab3e..387ab619 100644
--- a/pkg/harvester/mixins/harvester-vm/index.js
+++ b/pkg/harvester/mixins/harvester-vm/index.js
@@ -186,6 +186,7 @@ export default {
       terminationGracePeriodSeconds: '',
       cpuPinning:                    false,
       cpuModel:                      '',
+      sysprep:                       { secretName: '', xmlContent: '' },
     };
   },
 
@@ -445,6 +446,17 @@ export default {
       this['diskRows'] = diskRows;
       this['filesystemRows'] = this.getFilesystemRows(vm);
 
+      let sysprepConfig = { secretName: '', xmlContent: '' };
+
+      if (osType === 'windows') {
+        sysprepConfig = this.getSysprepConfig(spec);
+      }
+
+      this['sysprep'] = {
+        secretName: sysprepConfig.secretName || this.sysprep?.secretName || '',
+        xmlContent: sysprepConfig.xmlContent || this.sysprep?.xmlContent || '',
+      };
+
       this.refreshYamlEditor();
     },
 
@@ -609,7 +621,8 @@ export default {
 
       out = sortBy(out, 'bootOrder');
 
-      return out.filter( (O) => O.name !== 'cloudinitdisk');
+      // Filter out cloudinitdisk and sysprep disk from UI display.
+      return out.filter( (O) => O.name !== 'cloudinitdisk' && O.name !== 'sysprep');
     },
 
     getNetworkRows(vm, config) {
@@ -828,6 +841,32 @@ export default {
         this.secretName = this.generateSecretName(this.secretNamePrefix);
       }
 
+      if (!disks.find((D) => D.name === 'sysprep') && this.isWindows) {
+        const hasSysprepContent = !!this.sysprep.xmlContent?.trim?.();
+
+        // If we have content but no secret name, it's a new secret that needs a name.
+        if (hasSysprepContent && !this.sysprep.secretName?.trim?.()) {
+          const prefix = this.secretNamePrefix ? `${ this.secretNamePrefix }-windows-sysprep` : 'windows-sysprep';
+
+          this.sysprep.secretName = `${ this.value.metadata.namespace }/${ this.generateSecretName(prefix) }`;
+        }
+
+        // Preserve/attach sysprep whenever a secret is selected/known.
+        if (this.sysprep.secretName) {
+          disks.push({
+            name:  'sysprep',
+            cdrom: { bus: 'sata' }
+          });
+
+          const secretName = this.sysprep.secretName.split('/')[1] || this.sysprep.secretName;
+
+          volumes.push({
+            name:    'sysprep',
+            sysprep: { secret: { name: secretName } }
+          });
+        }
+      }
+
       if (!disks.find( (D) => D.name === 'cloudinitdisk') && (this.userData || this.networkData)) {
         if (!this.isWindows) {
           disks.push({
@@ -836,7 +875,6 @@ export default {
           });
 
           const userData = this.getUserData({ osType: this.osType, installAgent: this.installAgent });
-
           const cloudinitdisk = {
             name:             'cloudinitdisk',
             cloudInitNoCloud: {}
@@ -1482,6 +1520,42 @@ export default {
       }
     },
 
+    async saveSysprepConfig(vm) {
+      if (!this.isWindows) {
+        return;
+      }
+
+      if (!this.sysprep.secretName?.trim?.() && !this.sysprep.xmlContent?.trim?.()) {
+        return;
+      }
+
+      const secretName = this.sysprep.secretName.split('/')[1] || this.sysprep.secretName;
+      const namespace = vm.metadata.namespace;
+      const namespacedName = `${ namespace }/${ secretName }`;
+
+      let secret;
+
+      try {
+        secret = await this.$store.dispatch('harvester/find', { type: SECRET, id: namespacedName });
+      } catch (e) {
+        if (e?.status !== 404) {
+          throw e;
+        }
+
+        secret = await this.$store.dispatch('harvester/create', {
+          type:     SECRET,
+          metadata: {
+            name:      secretName,
+            namespace,
+            labels:    { [HCI_ANNOTATIONS.WINDOWS_SYSPREP]: 'true' },
+          },
+        });
+      }
+
+      secret.setData('autounattend.xml', this.sysprep.xmlContent);
+      await secret.save();
+    },
+
     getAccessCredentialsValidation() {
       const errors = [];