diff --git a/docs/07-users/01-overview.md b/docs/07-users/01-overview.md
index 4c460d470a..60341c0578 100644
--- a/docs/07-users/01-overview.md
+++ b/docs/07-users/01-overview.md
@@ -95,7 +95,7 @@ The `getFilamentAvatarUrl()` method is used to retrieve the avatar of the curren
 
 You can easily swap out [ui-avatars.com](https://ui-avatars.com) for a different service, by creating a new avatar provider.
 
-In this example, we create a new file at `app/Filament/AvatarProviders/BoringAvatarsProvider.php` for [boringavatars.com](https://boringavatars.com). The `get()` method accepts a user model instance and returns an avatar URL for that user:
+In this example, we create a new file at `app/Filament/AvatarProviders/BoringAvatarsProvider.php` for [boringavatars.com](https://boringavatars.com). The `get()` method accepts an Eloquent model or an `Authenticatable` user instance and returns an avatar URL for that record:
 
 ```php
 <?php
diff --git a/docs/14-upgrade-guide.md b/docs/14-upgrade-guide.md
index e4cfabe8c6..c4254eb297 100644
--- a/docs/14-upgrade-guide.md
+++ b/docs/14-upgrade-guide.md
@@ -346,6 +346,30 @@ See the [security documentation](../advanced/security#restricting-livewire-file-
 
 ### Low-impact changes
 
+<Disclosure open x-show="packages.includes('panels')">
+<span slot="summary">Custom avatar providers must accept non-Eloquent users</span>
+
+The `AvatarProvider::get()` method now accepts `Model | Authenticatable` instead of only `Model`, so avatar providers can receive users that do not extend an Eloquent model.
+
+If you have a custom avatar provider, update its `get()` parameter type:
+
+```php
+use Illuminate\Contracts\Auth\Authenticatable;
+use Illuminate\Database\Eloquent\Model;
+
+public function get(Model | Authenticatable $record): string
+{
+    // Return the avatar URL for the record.
+}
+```
+
+The automated upgrade script updates this parameter type when `get()` is declared directly on a class implementing `AvatarProvider` or an interface extending it. If your provider uses a `get()` method declared in a trait or inherited from a parent class that does not implement `AvatarProvider`, you must update that declaration manually.
+
+You should review your provider's implementation for Eloquent-specific method calls and handle non-Eloquent users if your application uses them. Providers that already accept both types, `object`, `mixed`, or an untyped parameter do not need a signature change.
+
+See the [custom avatar provider documentation](../users/overview#using-a-different-avatar-provider) for more details.
+</Disclosure>
+
 <Disclosure open x-show="packages.includes('support')">
 <span slot="summary">The modal content is now wrapped in a `fi-modal-window-scroll` element when using a sticky header or footer</span>
 
diff --git a/packages/panels/src/AvatarProviders/Contracts/AvatarProvider.php b/packages/panels/src/AvatarProviders/Contracts/AvatarProvider.php
index 3ebfc7ac67..54d66bd90f 100644
--- a/packages/panels/src/AvatarProviders/Contracts/AvatarProvider.php
+++ b/packages/panels/src/AvatarProviders/Contracts/AvatarProvider.php
@@ -2,9 +2,10 @@
 
 namespace Filament\AvatarProviders\Contracts;
 
+use Illuminate\Contracts\Auth\Authenticatable;
 use Illuminate\Database\Eloquent\Model;
 
 interface AvatarProvider
 {
-    public function get(Model $record): string;
+    public function get(Model | Authenticatable $record): string;
 }
diff --git a/packages/upgrade/src/Rector/WidenAvatarProviderParameterTypeRector.php b/packages/upgrade/src/Rector/WidenAvatarProviderParameterTypeRector.php
new file mode 100644
index 0000000000..e7f5213a6e
--- /dev/null
+++ b/packages/upgrade/src/Rector/WidenAvatarProviderParameterTypeRector.php
@@ -0,0 +1,82 @@
+<?php
+
+namespace Filament\Upgrade\Rector;
+
+use PhpParser\Node;
+use PhpParser\Node\Stmt\Class_;
+use PhpParser\Node\Stmt\Interface_;
+use PHPStan\Type\ObjectType;
+use PHPStan\Type\TypeCombinator;
+use Rector\PHPStanStaticTypeMapper\Enum\TypeKind;
+use Rector\Rector\AbstractRector;
+use Rector\StaticTypeMapper\StaticTypeMapper;
+use Symplify\RuleDocGenerator\ValueObject\CodeSample\CodeSample;
+use Symplify\RuleDocGenerator\ValueObject\RuleDefinition;
+
+class WidenAvatarProviderParameterTypeRector extends AbstractRector
+{
+    public function __construct(
+        private StaticTypeMapper $staticTypeMapper,
+    ) {}
+
+    public function getRuleDefinition(): RuleDefinition
+    {
+        return new RuleDefinition('Allow avatar providers to accept non-Eloquent users', [
+            new CodeSample(
+                <<<'PHP'
+                    class CustomAvatarProvider implements \Filament\AvatarProviders\Contracts\AvatarProvider
+                    {
+                        public function get(\Illuminate\Database\Eloquent\Model $record): string
+                        {
+                            return 'https://example.com/avatar.svg';
+                        }
+                    }
+                    PHP,
+                <<<'PHP'
+                    class CustomAvatarProvider implements \Filament\AvatarProviders\Contracts\AvatarProvider
+                    {
+                        public function get(\Illuminate\Database\Eloquent\Model | \Illuminate\Contracts\Auth\Authenticatable $record): string
+                        {
+                            return 'https://example.com/avatar.svg';
+                        }
+                    }
+                    PHP,
+            ),
+        ]);
+    }
+
+    public function getNodeTypes(): array
+    {
+        return [Class_::class, Interface_::class];
+    }
+
+    /**
+     * @param  Class_ | Interface_  $node
+     */
+    public function refactor(Node $node): ?Node
+    {
+        if (! $this->isObjectType($node, new ObjectType('Filament\\AvatarProviders\\Contracts\\AvatarProvider'))) {
+            return null;
+        }
+
+        $parameter = $node->getMethod('get')?->params[0] ?? null;
+
+        if (! $parameter?->type) {
+            return null;
+        }
+
+        $parameterType = $this->getType($parameter->type);
+        $authenticatableType = new ObjectType('Illuminate\\Contracts\\Auth\\Authenticatable');
+
+        if ($parameterType->isSuperTypeOf($authenticatableType)->yes()) {
+            return null;
+        }
+
+        $parameter->type = $this->staticTypeMapper->mapPHPStanTypeToPhpParserNode(
+            TypeCombinator::union($parameterType, $authenticatableType),
+            TypeKind::PARAM,
+        );
+
+        return $node;
+    }
+}
diff --git a/packages/upgrade/src/rector.php b/packages/upgrade/src/rector.php
index e698ae881a..120dda1752 100644
--- a/packages/upgrade/src/rector.php
+++ b/packages/upgrade/src/rector.php
@@ -1,6 +1,7 @@
 <?php
 
 use Composer\InstalledVersions;
+use Filament\Upgrade\Rector\WidenAvatarProviderParameterTypeRector;
 use Rector\Config\RectorConfig;
 use Rector\Removing\Rector\Class_\RemoveTraitUseRector;
 
@@ -12,4 +13,6 @@ return static function (RectorConfig $rectorConfig): void {
     $rectorConfig->ruleWithConfiguration(RemoveTraitUseRector::class, [
         'Filament\\Schemas\\Concerns\\RestrictsFileUploadsToSchemaComponents',
     ]);
+
+    $rectorConfig->rule(WidenAvatarProviderParameterTypeRector::class);
 };
diff --git a/tests/src/Panels/Configuration/AvatarProviderTest.php b/tests/src/Panels/Configuration/AvatarProviderTest.php
index 3ec155071f..80a552d79f 100644
--- a/tests/src/Panels/Configuration/AvatarProviderTest.php
+++ b/tests/src/Panels/Configuration/AvatarProviderTest.php
@@ -1,8 +1,13 @@
 <?php
 
 use Filament\AvatarProviders\UiAvatarsProvider;
+use Filament\Facades\Filament;
+use Filament\Models\Contracts\HasAvatar;
+use Filament\Models\Contracts\HasName;
 use Filament\Tests\Fixtures\Models\User;
 use Filament\Tests\Panels\Configuration\TestCase;
+use Illuminate\Auth\GenericUser;
+use Illuminate\Database\Eloquent\Model;
 
 uses(TestCase::class);
 
@@ -16,6 +21,42 @@ it('returns a URL string from `get()`', function (): void {
     expect($url)->toStartWith('https://ui-avatars.com/api/');
 });
 
+it('generates default avatars for `Model` and non-Eloquent `Authenticatable` records', function (bool $isEloquent): void {
+    $record = $isEloquent
+        ? new class extends Model implements HasAvatar, HasName
+        {
+            public function getFilamentAvatarUrl(): ?string
+            {
+                return null;
+            }
+
+            public function getFilamentName(): string
+            {
+                return 'Taylor Morgan';
+            }
+        }
+    : new class([]) extends GenericUser implements HasAvatar, HasName
+    {
+        public function getFilamentAvatarUrl(): ?string
+        {
+            return null;
+        }
+
+        public function getFilamentName(): string
+        {
+            return 'Jordan Ellis';
+        }
+    };
+
+    $url = Filament::getUserAvatarUrl($record);
+
+    expect($url)->toStartWith('https://ui-avatars.com/api/');
+    expect($url)->toContain($isEloquent ? 'name=T+M' : 'name=J+E');
+})->with([
+    'Eloquent model' => [true],
+    'non-Eloquent user' => [false],
+]);
+
 it('includes encoded name in the URL', function (): void {
     $provider = new UiAvatarsProvider;
     $user = User::factory()->create(['name' => 'Jane Smith']);
diff --git a/tests/src/Upgrade/Fixtures/avatar_providers.php.inc b/tests/src/Upgrade/Fixtures/avatar_providers.php.inc
new file mode 100644
index 0000000000..96258c9872
--- /dev/null
+++ b/tests/src/Upgrade/Fixtures/avatar_providers.php.inc
@@ -0,0 +1,139 @@
+<?php
+
+namespace Filament\Tests\Upgrade\Fixtures\AvatarProviders;
+
+use Filament\AvatarProviders\Contracts\AvatarProvider as Provider;
+use Filament\AvatarProviders\UiAvatarsProvider;
+use Illuminate\Contracts\Auth\Authenticatable;
+use Illuminate\Database\Eloquent\Model as Record;
+
+class CustomAvatarProvider implements Provider
+{
+    public function get(Record $user): string
+    {
+        return 'https://example.com/avatar.svg';
+    }
+}
+
+interface CustomAvatarProviderContract extends Provider
+{
+    public function get(Record $record): string;
+}
+
+class InheritedAvatarProvider extends UiAvatarsProvider
+{
+    public function get(?Record $record): string
+    {
+        return 'https://example.com/avatar.svg';
+    }
+}
+
+class UnionAvatarProvider implements Provider
+{
+    public function get(Record | Authenticatable $record): string
+    {
+        return 'https://example.com/avatar.svg';
+    }
+}
+
+class MixedAvatarProvider implements Provider
+{
+    public function get(mixed $record): string
+    {
+        return 'https://example.com/avatar.svg';
+    }
+}
+
+class ObjectAvatarProvider implements Provider
+{
+    public function get(object $record): string
+    {
+        return 'https://example.com/avatar.svg';
+    }
+}
+
+class UntypedAvatarProvider implements Provider
+{
+    public function get($record): string
+    {
+        return 'https://example.com/avatar.svg';
+    }
+}
+
+class UnrelatedProvider
+{
+    public function get(Record $record): string
+    {
+        return 'https://example.com/avatar.svg';
+    }
+}
+-----
+<?php
+
+namespace Filament\Tests\Upgrade\Fixtures\AvatarProviders;
+
+use Filament\AvatarProviders\Contracts\AvatarProvider as Provider;
+use Filament\AvatarProviders\UiAvatarsProvider;
+use Illuminate\Contracts\Auth\Authenticatable;
+use Illuminate\Database\Eloquent\Model as Record;
+
+class CustomAvatarProvider implements Provider
+{
+    public function get(\Illuminate\Database\Eloquent\Model|\Illuminate\Contracts\Auth\Authenticatable $user): string
+    {
+        return 'https://example.com/avatar.svg';
+    }
+}
+
+interface CustomAvatarProviderContract extends Provider
+{
+    public function get(\Illuminate\Database\Eloquent\Model|\Illuminate\Contracts\Auth\Authenticatable $record): string;
+}
+
+class InheritedAvatarProvider extends UiAvatarsProvider
+{
+    public function get(\Illuminate\Database\Eloquent\Model|\Illuminate\Contracts\Auth\Authenticatable|null $record): string
+    {
+        return 'https://example.com/avatar.svg';
+    }
+}
+
+class UnionAvatarProvider implements Provider
+{
+    public function get(Record | Authenticatable $record): string
+    {
+        return 'https://example.com/avatar.svg';
+    }
+}
+
+class MixedAvatarProvider implements Provider
+{
+    public function get(mixed $record): string
+    {
+        return 'https://example.com/avatar.svg';
+    }
+}
+
+class ObjectAvatarProvider implements Provider
+{
+    public function get(object $record): string
+    {
+        return 'https://example.com/avatar.svg';
+    }
+}
+
+class UntypedAvatarProvider implements Provider
+{
+    public function get($record): string
+    {
+        return 'https://example.com/avatar.svg';
+    }
+}
+
+class UnrelatedProvider
+{
+    public function get(Record $record): string
+    {
+        return 'https://example.com/avatar.svg';
+    }
+}
diff --git a/tests/src/Upgrade/WidenAvatarProviderParameterTypeRectorTest.php b/tests/src/Upgrade/WidenAvatarProviderParameterTypeRectorTest.php
new file mode 100644
index 0000000000..0575bd4ea9
--- /dev/null
+++ b/tests/src/Upgrade/WidenAvatarProviderParameterTypeRectorTest.php
@@ -0,0 +1,18 @@
+<?php
+
+namespace Filament\Tests\Upgrade;
+
+use Rector\Testing\PHPUnit\AbstractRectorTestCase;
+
+class WidenAvatarProviderParameterTypeRectorTest extends AbstractRectorTestCase
+{
+    public function test_widens_avatar_providers_without_narrowing_compatible_signatures(): void
+    {
+        $this->doTestFile(__DIR__ . '/Fixtures/avatar_providers.php.inc');
+    }
+
+    public function provideConfigFilePath(): string
+    {
+        return dirname(__DIR__, 3) . '/packages/upgrade/src/rector.php';
+    }
+}