diff --git a/fasthtml/components.py b/fasthtml/components.py
index 68ae3978..f82ed9a0 100644
--- a/fasthtml/components.py
+++ b/fasthtml/components.py
@@ -121,7 +121,10 @@ def _fill_item(item, obj):
     if val is not None and not 'skip' in attr:
         if tag=='input':
             if attr.get('type', '') == 'checkbox':
-                if val: attr['checked'] = '1'
+                if isinstance(val, list):
+                    if attr['value'] in val: attr['checked'] = '1'
+                    else: attr.pop('checked', '')
+                elif val: attr['checked'] = '1'
                 else: attr.pop('checked', '')
             elif attr.get('type', '') == 'radio':
                 if val and val == attr['value']: attr['checked'] = '1'
@@ -129,8 +132,13 @@ def _fill_item(item, obj):
             else: attr['value'] = val
         if tag=='textarea': cs=(val,)
         if tag == 'select':
-            option = next((o for o in cs if o.tag=='option' and o.get('value')==val), None)
-            if option: option.selected = '1'
+            if isinstance(val, list):
+                for opt in cs:
+                    if opt.tag == 'option' and opt.get('value') in val:
+                        opt.selected = '1'
+            else:
+                option = next((o for o in cs if o.tag=='option' and o.get('value')==val), None)
+                if option: option.selected = '1'
     return FT(tag,cs,attr,void_=item.void_)
 
 # %% ../nbs/api/01_components.ipynb
diff --git a/nbs/api/01_components.ipynb b/nbs/api/01_components.ipynb
index bd5e0a52..0361f3fd 100644
--- a/nbs/api/01_components.ipynb
+++ b/nbs/api/01_components.ipynb
@@ -447,7 +447,10 @@
     "    if val is not None and not 'skip' in attr:\n",
     "        if tag=='input':\n",
     "            if attr.get('type', '') == 'checkbox':\n",
-    "                if val: attr['checked'] = '1'\n",
+    "                if isinstance(val, list):\n",
+    "                    if attr['value'] in val: attr['checked'] = '1'\n",
+    "                    else: attr.pop('checked', '')\n",
+    "                elif val: attr['checked'] = '1'\n",
     "                else: attr.pop('checked', '')\n",
     "            elif attr.get('type', '') == 'radio':\n",
     "                if val and val == attr['value']: attr['checked'] = '1'\n",
@@ -455,8 +458,13 @@
     "            else: attr['value'] = val\n",
     "        if tag=='textarea': cs=(val,)\n",
     "        if tag == 'select':\n",
-    "            option = next((o for o in cs if o.tag=='option' and o.get('value')==val), None)\n",
-    "            if option: option.selected = '1'\n",
+    "            if isinstance(val, list):\n",
+    "                for opt in cs:\n",
+    "                    if opt.tag == 'option' and opt.get('value') in val:\n",
+    "                        opt.selected = '1'\n",
+    "            else:\n",
+    "                option = next((o for o in cs if o.tag=='option' and o.get('value')==val), None)\n",
+    "                if option: option.selected = '1'\n",
     "    return FT(tag,cs,attr,void_=item.void_)"
    ]
   },
@@ -516,6 +524,83 @@
     "form"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "1513cf64",
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/markdown": [
+       "```html\n",
+       "<form><select multiple=\"1\" name=\"items\"><option value=\"a\" selected=\"1\">a</option><option value=\"b\">b</option><option value=\"c\" selected=\"1\">c</option></select></form>\n",
+       "```"
+      ],
+      "text/plain": [
+       "form((select((option(('a',),{'value': 'a', 'selected': '1'}), option(('b',),{'value': 'b'}), option(('c',),{'value': 'c', 'selected': '1'})),{'multiple': '1', 'name': 'items'}),),{})"
+      ]
+     },
+     "execution_count": null,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "@dataclass\n",
+    "class MultiSelect:\n",
+    "    items: list[str]\n",
+    "\n",
+    "multiselect = MultiSelect(items=['a', 'c'])\n",
+    "multiform = Form(Select(Option('a', value='a'), Option('b', value='b'), Option('c', value='c'), multiple='1', name='items'))\n",
+    "multiform = fill_form(multiform, multiselect)\n",
+    "assert '<option value=\"a\" selected=\"1\">a</option>' in to_xml(multiform)\n",
+    "assert '<option value=\"b\">b</option>' in to_xml(multiform)\n",
+    "assert '<option value=\"c\" selected=\"1\">c</option>' in to_xml(multiform)\n",
+    "multiform"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "dd316f94-0695-44bf-96c2-45128a8b0644",
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/markdown": [
+       "```html\n",
+       "<form><fieldset><label>      <input type=\"checkbox\" name=\"items\" value=\"a\" checked=\"1\">\n",
+       "a</label><label>      <input type=\"checkbox\" name=\"items\" value=\"b\">\n",
+       "b</label><label>      <input type=\"checkbox\" name=\"items\" value=\"c\" checked=\"1\">\n",
+       "c</label></fieldset></form>\n",
+       "```"
+      ],
+      "text/plain": [
+       "form((fieldset((label((input((),{'type': 'checkbox', 'name': 'items', 'value': 'a', 'checked': '1'}), 'a'),{}), label((input((),{'type': 'checkbox', 'name': 'items', 'value': 'b'}), 'b'),{}), label((input((),{'type': 'checkbox', 'name': 'items', 'value': 'c', 'checked': '1'}), 'c'),{})),{}),),{})"
+      ]
+     },
+     "execution_count": null,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "@dataclass\n",
+    "class MultiCheck:\n",
+    "    items: list[str]\n",
+    "\n",
+    "multicheck = MultiCheck(items=['a', 'c'])\n",
+    "multiform = Form(Fieldset(Label(Input(type='checkbox', name='items', value='a'), 'a'),\n",
+    "                          Label(Input(type='checkbox', name='items', value='b'), 'b'),\n",
+    "                          Label(Input(type='checkbox', name='items', value='c'), 'c')))\n",
+    "multiform = fill_form(multiform, multicheck)\n",
+    "assert '<input type=\"checkbox\" name=\"items\" value=\"a\" checked=\"1\">' in to_xml(multiform)\n",
+    "assert '<input type=\"checkbox\" name=\"items\" value=\"b\">' in to_xml(multiform)\n",
+    "assert '<input type=\"checkbox\" name=\"items\" value=\"c\" checked=\"1\">' in to_xml(multiform)\n",
+    "multiform"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": null,