diff --git a/README.md b/README.md
index 60edd9a4..27f52bf3 100644
--- a/README.md
+++ b/README.md
@@ -79,6 +79,7 @@ Polyfills are provided for:
 - the `NoDiscard` attribute introduced in PHP 8.5;
 - the `array_first` and `array_last` functions introduced in PHP 8.5;
 - the `DelayedTargetValidation` attribute introduced in PHP 8.5;
+- the `clamp` function introduced in PHP 8.6;
 
 It is strongly recommended to upgrade your PHP version and/or install the missing
 extensions whenever possible. This polyfill should be used only when there is no
diff --git a/composer.json b/composer.json
index bfd95859..2997fb66 100644
--- a/composer.json
+++ b/composer.json
@@ -34,6 +34,7 @@
         "symfony/polyfill-php83": "self.version",
         "symfony/polyfill-php84": "self.version",
         "symfony/polyfill-php85": "self.version",
+        "symfony/polyfill-php86": "self.version",
         "symfony/polyfill-iconv": "self.version",
         "symfony/polyfill-intl-grapheme": "self.version",
         "symfony/polyfill-intl-icu": "self.version",
diff --git a/src/Php86/LICENSE b/src/Php86/LICENSE
new file mode 100644
index 00000000..bc38d714
--- /dev/null
+++ b/src/Php86/LICENSE
@@ -0,0 +1,19 @@
+Copyright (c) 2025-present Fabien Potencier
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is furnished
+to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
diff --git a/src/Php86/Php86.php b/src/Php86/Php86.php
new file mode 100644
index 00000000..e0f08e36
--- /dev/null
+++ b/src/Php86/Php86.php
@@ -0,0 +1,65 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Polyfill\Php86;
+
+/**
+ * @author kylekatarnls <kylekatarnls@gmail.com>
+ *
+ * @internal
+ */
+final class Php86
+{
+    /**
+     * @template V
+     * @template L
+     * @template H
+     *
+     * @param V $value
+     * @param L $min
+     * @param H $max
+     *
+     * @return V|L|H
+     */
+    public static function clamp($value, $min, $max)
+    {
+        if (\is_float($min) && \is_nan($min)) {
+            self::throwValueErrorIfAvailable('clamp(): Argument #2 ($min) cannot be NAN');
+        }
+
+        if (\is_float($max) && is_nan($max)) {
+            self::throwValueErrorIfAvailable('clamp(): Argument #3 ($max) cannot be NAN');
+        }
+
+        if ($max < $min) {
+            self::throwValueErrorIfAvailable('clamp(): Argument #2 ($min) must be smaller than or equal to argument #3 ($max)');
+        }
+
+        if ($value > $max) {
+            return $max;
+        }
+
+        if ($value < $min) {
+            return $min;
+        }
+
+        return $value;
+    }
+
+    private static function throwValueErrorIfAvailable(string $message): void
+    {
+        if (!class_exists(\ValueError::class)) {
+            throw new \InvalidArgumentException($message);
+        }
+
+        throw new \ValueError($message);
+    }
+}
diff --git a/src/Php86/README.md b/src/Php86/README.md
new file mode 100644
index 00000000..2087e342
--- /dev/null
+++ b/src/Php86/README.md
@@ -0,0 +1,14 @@
+Symfony Polyfill / Php86
+========================
+
+This component provides features added to PHP 8.6 core:
+
+- [`clamp`](https://wiki.php.net/rfc/clamp_v2)
+
+More information can be found in the
+[main Polyfill README](https://github.com/symfony/polyfill/blob/main/README.md).
+
+License
+=======
+
+This library is released under the [MIT license](LICENSE).
diff --git a/src/Php86/bootstrap.php b/src/Php86/bootstrap.php
new file mode 100644
index 00000000..23170966
--- /dev/null
+++ b/src/Php86/bootstrap.php
@@ -0,0 +1,31 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+use Symfony\Polyfill\Php86 as p;
+
+if (\PHP_VERSION_ID >= 80600) {
+    return;
+}
+
+if (!function_exists('clamp')) {
+    /**
+     * @template V
+     * @template L
+     * @template H
+     *
+     * @param V $value
+     * @param L $min
+     * @param H $max
+     *
+     * @return V|L|H
+     */
+    function clamp($value, $min, $max) { return p\Php86::clamp($value, $min, $max); }
+}
diff --git a/src/Php86/composer.json b/src/Php86/composer.json
new file mode 100644
index 00000000..e13cd9d8
--- /dev/null
+++ b/src/Php86/composer.json
@@ -0,0 +1,32 @@
+{
+    "name": "symfony/polyfill-php86",
+    "type": "library",
+    "description": "Symfony polyfill backporting some PHP 8.6+ features to lower PHP versions",
+    "keywords": ["polyfill", "shim", "compatibility", "portable"],
+    "homepage": "https://symfony.com",
+    "license": "MIT",
+    "authors": [
+        {
+            "name": "Nicolas Grekas",
+            "email": "p@tchwork.com"
+        },
+        {
+            "name": "Symfony Community",
+            "homepage": "https://symfony.com/contributors"
+        }
+    ],
+    "require": {
+        "php": ">=7.2"
+    },
+    "autoload": {
+        "psr-4": { "Symfony\\Polyfill\\Php86\\": "" },
+        "files": [ "bootstrap.php" ]
+    },
+    "minimum-stability": "dev",
+    "extra": {
+        "thanks": {
+            "name": "symfony/polyfill",
+            "url": "https://github.com/symfony/polyfill"
+        }
+    }
+}
diff --git a/src/bootstrap.php b/src/bootstrap.php
index aa7e46e3..e65fd944 100644
--- a/src/bootstrap.php
+++ b/src/bootstrap.php
@@ -40,3 +40,7 @@
 if (\PHP_VERSION_ID < 80500) {
     require __DIR__.'/Php85/bootstrap.php';
 }
+
+if (\PHP_VERSION_ID < 80600) {
+    require __DIR__.'/Php86/bootstrap.php';
+}
diff --git a/tests/Php86/Php86Test.php b/tests/Php86/Php86Test.php
new file mode 100644
index 00000000..1316f0d7
--- /dev/null
+++ b/tests/Php86/Php86Test.php
@@ -0,0 +1,97 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Polyfill\Tests\Php86;
+
+use PHPUnit\Framework\TestCase;
+
+class Php86Test extends TestCase
+{
+    public function testClamp(): void
+    {
+        $this->assertSame(2, clamp(2, 1, 3));
+        $this->assertSame(1, clamp(0, 1, 3));
+        $this->assertSame(3, clamp(6, 1, 3));
+        $this->assertSame(2, clamp(2, 1.3, 3.4));
+        $this->assertSame(2.5, clamp(2.5, 1, 3));
+        $this->assertSame(2.5, clamp(2.5, 1.3, 3.4));
+        $this->assertSame(1.3, clamp(0, 1.3, 3.4));
+        $this->assertSame(M_PI, clamp(M_PI, -INF, INF));
+        $this->assertTrue(is_nan(clamp(NAN, 4, 6)));
+        $this->assertSame('c', clamp('a', 'c', 'g'));
+        $this->assertSame('d', clamp('d', 'c', 'g'));
+        $this->assertSame('2025-08-15', clamp('2025-08-01', '2025-08-15', '2025-09-15'));
+        $this->assertSame('2025-08-20', clamp('2025-08-20', '2025-08-15', '2025-09-15'));
+        $this->assertSame('2025-08-15', clamp(new \DateTimeImmutable('2025-08-01'), new \DateTimeImmutable('2025-08-15'), new \DateTimeImmutable('2025-09-15'))->format('Y-m-d'));
+        $this->assertSame('2025-08-20', clamp(new \DateTimeImmutable('2025-08-20'), new \DateTimeImmutable('2025-08-15'), new \DateTimeImmutable('2025-09-15'))->format('Y-m-d'));
+        $this->assertSame(-1, clamp(null, -1, 1));
+        $this->assertSame(1, clamp(null, 1, 3));
+        $this->assertSame(-3, clamp(null, -3, -1));
+        $this->assertSame(-9999, clamp(-9999, null, 10));
+        $this->assertSame(10, clamp(12, null, 10));
+        $a = new \InvalidArgumentException('a');
+        $b = new \RuntimeException('b');
+        $c = new \LogicException('c');
+        $this->assertSame($a, clamp($a, $b, $c));
+        $this->assertSame($b, clamp($b, $a, $c));
+        $this->assertSame($c, clamp($c, $a, $b));
+
+        $errorMessage = null;
+
+        try {
+            clamp(4, NAN, 6);
+        } catch (\ValueError $error) {
+            $errorMessage = $error->getMessage();
+        }
+
+        $this->assertSame('clamp(): Argument #2 ($min) cannot be NAN', $errorMessage);
+
+        $errorMessage = null;
+
+        try {
+            clamp(7, 6, NAN);
+        } catch (\ValueError $error) {
+            $errorMessage = $error->getMessage();
+        }
+
+        $this->assertSame('clamp(): Argument #3 ($max) cannot be NAN', $errorMessage);
+
+        $errorMessage = null;
+
+        try {
+            clamp(1, 3, 2);
+        } catch (\ValueError $error) {
+            $errorMessage = $error->getMessage();
+        }
+
+        $this->assertSame('clamp(): Argument #2 ($min) must be smaller than or equal to argument #3 ($max)', $errorMessage);
+
+        $errorMessage = null;
+
+        try {
+            clamp(-9999, 5, null);
+        } catch (\ValueError $error) {
+            $errorMessage = $error->getMessage();
+        }
+
+        $this->assertSame('clamp(): Argument #2 ($min) must be smaller than or equal to argument #3 ($max)', $errorMessage);
+
+        $errorMessage = null;
+
+        try {
+            clamp(12, -5, null);
+        } catch (\ValueError $error) {
+            $errorMessage = $error->getMessage();
+        }
+
+        $this->assertSame('clamp(): Argument #2 ($min) must be smaller than or equal to argument #3 ($max)', $errorMessage);
+    }
+}