diff --git a/packages/plugins/plugin-auth/src/auth-plugin.ts b/packages/plugins/plugin-auth/src/auth-plugin.ts
index 17e8da5b6..0ccf07fc2 100644
--- a/packages/plugins/plugin-auth/src/auth-plugin.ts
+++ b/packages/plugins/plugin-auth/src/auth-plugin.ts
@@ -7,7 +7,7 @@ import {
   SysUser, SysSession, SysAccount, SysVerification,
   SysOrganization, SysMember, SysInvitation,
   SysTeam, SysTeamMember,
-  SysApiKey, SysTwoFactor,
+  SysApiKey, SysTwoFactor, SysUserPreference,
 } from './objects/index.js';
 
 /**
@@ -107,7 +107,7 @@ export class AuthPlugin implements Plugin {
         SysUser, SysSession, SysAccount, SysVerification,
         SysOrganization, SysMember, SysInvitation,
         SysTeam, SysTeamMember,
-        SysApiKey, SysTwoFactor,
+        SysApiKey, SysTwoFactor, SysUserPreference,
       ],
     });
 
diff --git a/packages/plugins/plugin-auth/src/objects/index.ts b/packages/plugins/plugin-auth/src/objects/index.ts
index b84cb452c..8575bf113 100644
--- a/packages/plugins/plugin-auth/src/objects/index.ts
+++ b/packages/plugins/plugin-auth/src/objects/index.ts
@@ -27,6 +27,7 @@ export { SysTeamMember } from './sys-team-member.object.js';
 // ── Additional Auth Objects ────────────────────────────────────────────────
 export { SysApiKey } from './sys-api-key.object.js';
 export { SysTwoFactor } from './sys-two-factor.object.js';
+export { SysUserPreference } from './sys-user-preference.object.js';
 
 // ── Backward Compatibility (deprecated) ────────────────────────────────────
 /** @deprecated Use `SysUser` instead */
diff --git a/packages/plugins/plugin-auth/src/objects/sys-user-preference.object.ts b/packages/plugins/plugin-auth/src/objects/sys-user-preference.object.ts
new file mode 100644
index 000000000..c1c9a7e7b
--- /dev/null
+++ b/packages/plugins/plugin-auth/src/objects/sys-user-preference.object.ts
@@ -0,0 +1,82 @@
+// Copyright (c) 2025 ObjectStack. Licensed under the Apache-2.0 license.
+
+import { ObjectSchema, Field } from '@objectstack/spec/data';
+
+/**
+ * sys_user_preference — System User Preference Object
+ *
+ * Per-user key-value preferences for storing UI state, settings, and personalization.
+ * Supports the User Preferences layer in the Config Resolution hierarchy
+ * (Runtime > User Preferences > Tenant > Env).
+ *
+ * Common use cases:
+ * - UI preferences: theme, locale, timezone, sidebar state
+ * - Feature flags: plugin.ai.auto_save, plugin.dev.debug_mode
+ * - User-specific settings: default_view, notifications_enabled
+ *
+ * @namespace sys
+ */
+export const SysUserPreference = ObjectSchema.create({
+  namespace: 'sys',
+  name: 'user_preference',
+  label: 'User Preference',
+  pluralLabel: 'User Preferences',
+  icon: 'settings',
+  isSystem: true,
+  description: 'Per-user key-value preferences (theme, locale, etc.)',
+  titleFormat: '{key}',
+  compactLayout: ['user_id', 'key'],
+
+  fields: {
+    id: Field.text({
+      label: 'Preference ID',
+      required: true,
+      readonly: true,
+    }),
+
+    created_at: Field.datetime({
+      label: 'Created At',
+      defaultValue: 'NOW()',
+      readonly: true,
+    }),
+
+    updated_at: Field.datetime({
+      label: 'Updated At',
+      defaultValue: 'NOW()',
+      readonly: true,
+    }),
+
+    user_id: Field.text({
+      label: 'User ID',
+      required: true,
+      maxLength: 255,
+      description: 'Owner user of this preference',
+    }),
+
+    key: Field.text({
+      label: 'Key',
+      required: true,
+      maxLength: 255,
+      description: 'Preference key (e.g., theme, locale, plugin.ai.auto_save)',
+    }),
+
+    value: Field.json({
+      label: 'Value',
+      description: 'Preference value (any JSON-serializable type)',
+    }),
+  },
+
+  indexes: [
+    { fields: ['user_id', 'key'], unique: true },
+    { fields: ['user_id'], unique: false },
+  ],
+
+  enable: {
+    trackHistory: false,
+    searchable: false,
+    apiEnabled: true,
+    apiMethods: ['get', 'list', 'create', 'update', 'delete'],
+    trash: false,
+    mru: false,
+  },
+});
diff --git a/packages/spec/src/system/constants/system-names.test.ts b/packages/spec/src/system/constants/system-names.test.ts
index aa6804586..a662d1e49 100644
--- a/packages/spec/src/system/constants/system-names.test.ts
+++ b/packages/spec/src/system/constants/system-names.test.ts
@@ -22,6 +22,7 @@ describe('SystemObjectName', () => {
     expect(SystemObjectName.TEAM_MEMBER).toBe('sys_team_member');
     expect(SystemObjectName.API_KEY).toBe('sys_api_key');
     expect(SystemObjectName.TWO_FACTOR).toBe('sys_two_factor');
+    expect(SystemObjectName.USER_PREFERENCE).toBe('sys_user_preference');
     expect(SystemObjectName.ROLE).toBe('sys_role');
     expect(SystemObjectName.PERMISSION_SET).toBe('sys_permission_set');
     expect(SystemObjectName.AUDIT_LOG).toBe('sys_audit_log');
@@ -54,6 +55,7 @@ describe('SystemObjectName', () => {
     expect(keys).toContain('TEAM_MEMBER');
     expect(keys).toContain('API_KEY');
     expect(keys).toContain('TWO_FACTOR');
+    expect(keys).toContain('USER_PREFERENCE');
     expect(keys).toContain('ROLE');
     expect(keys).toContain('PERMISSION_SET');
     expect(keys).toContain('AUDIT_LOG');
diff --git a/packages/spec/src/system/constants/system-names.ts b/packages/spec/src/system/constants/system-names.ts
index 5989b22b1..8ddf7030d 100644
--- a/packages/spec/src/system/constants/system-names.ts
+++ b/packages/spec/src/system/constants/system-names.ts
@@ -42,6 +42,8 @@ export const SystemObjectName = {
   API_KEY: 'sys_api_key',
   /** Authentication: two-factor authentication credentials */
   TWO_FACTOR: 'sys_two_factor',
+  /** Authentication: user preferences (theme, locale, etc.) */
+  USER_PREFERENCE: 'sys_user_preference',
   /** Security: role definition for RBAC */
   ROLE: 'sys_role',
   /** Security: permission set grouping */