diff --git a/config/set/common/namespaces.php b/config/set/common/namespaces.php
index d2b2b2301d..4afcee6dec 100644
--- a/config/set/common/namespaces.php
+++ b/config/set/common/namespaces.php
@@ -6,6 +6,7 @@
 use PhpCsFixer\Fixer\Import\NoUnusedImportsFixer;
 use PhpCsFixer\Fixer\Import\OrderedImportsFixer;
 use PhpCsFixer\Fixer\NamespaceNotation\SingleBlankLineBeforeNamespaceFixer;
+use Symplify\CodingStandard\Fixer\ConstantNotation\RemoveSlashFromNativeConstantFixer;
 use Symplify\EasyCodingStandard\Config\ECSConfig;
 
 return ECSConfig::configure()
@@ -14,4 +15,5 @@
         OrderedImportsFixer::class,
         SingleBlankLineBeforeNamespaceFixer::class,
         NoUnneededImportAliasFixer::class,
+        RemoveSlashFromNativeConstantFixer::class,
     ]);
diff --git a/packages/coding-standard/src/Fixer/ConstantNotation/RemoveSlashFromNativeConstantFixer.php b/packages/coding-standard/src/Fixer/ConstantNotation/RemoveSlashFromNativeConstantFixer.php
new file mode 100644
index 0000000000..948360181a
--- /dev/null
+++ b/packages/coding-standard/src/Fixer/ConstantNotation/RemoveSlashFromNativeConstantFixer.php
@@ -0,0 +1,77 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Symplify\CodingStandard\Fixer\ConstantNotation;
+
+use PhpCsFixer\FixerDefinition\CodeSample;
+use PhpCsFixer\FixerDefinition\FixerDefinition;
+use PhpCsFixer\FixerDefinition\FixerDefinitionInterface;
+use PhpCsFixer\Tokenizer\Token;
+use PhpCsFixer\Tokenizer\Tokens;
+use SplFileInfo;
+use Symplify\CodingStandard\Fixer\AbstractSymplifyFixer;
+
+/**
+ * @see \Symplify\CodingStandard\Tests\Fixer\ConstantNotation\RemoveSlashFromNativeConstantFixer\RemoveSlashFromNativeConstantFixerTest
+ */
+final class RemoveSlashFromNativeConstantFixer extends AbstractSymplifyFixer
+{
+    private const string ERROR_MESSAGE = 'Remove leading backslash from "true", "false" and "null".';
+
+    /**
+     * @var string[]
+     */
+    private const array KEYWORDS = ['true', 'false', 'null'];
+
+    public function getDefinition(): FixerDefinitionInterface
+    {
+        return new FixerDefinition(self::ERROR_MESSAGE, [new CodeSample("<?php\nreturn \\true;\n")]);
+    }
+
+    /**
+     * @param Tokens<Token> $tokens
+     */
+    public function isCandidate(Tokens $tokens): bool
+    {
+        return $tokens->isTokenKindFound(T_NS_SEPARATOR);
+    }
+
+    /**
+     * @param Tokens<Token> $tokens
+     */
+    public function fix(SplFileInfo $fileInfo, Tokens $tokens): void
+    {
+        foreach ($tokens as $index => $token) {
+            if (! $token->isGivenKind(T_NS_SEPARATOR)) {
+                continue;
+            }
+
+            $nextIndex = $tokens->getNextMeaningfulToken($index);
+            if ($nextIndex === null) {
+                continue;
+            }
+
+            if (! $tokens[$nextIndex]->isGivenKind(T_STRING)) {
+                continue;
+            }
+
+            if (! in_array(strtolower($tokens[$nextIndex]->getContent()), self::KEYWORDS, true)) {
+                continue;
+            }
+
+            // the keyword must be a standalone name, not a namespace segment like "Foo\true" or "\true\Bar"
+            $prevIndex = $tokens->getPrevMeaningfulToken($index);
+            if ($prevIndex !== null && $tokens[$prevIndex]->isGivenKind([T_STRING, T_NS_SEPARATOR])) {
+                continue;
+            }
+
+            $afterKeywordIndex = $tokens->getNextMeaningfulToken($nextIndex);
+            if ($afterKeywordIndex !== null && $tokens[$afterKeywordIndex]->isGivenKind(T_NS_SEPARATOR)) {
+                continue;
+            }
+
+            $tokens->clearAt($index);
+        }
+    }
+}
diff --git a/packages/coding-standard/tests/Fixer/ConstantNotation/RemoveSlashFromNativeConstantFixer/Fixture/fix_bool_and_null.php.inc b/packages/coding-standard/tests/Fixer/ConstantNotation/RemoveSlashFromNativeConstantFixer/Fixture/fix_bool_and_null.php.inc
new file mode 100644
index 0000000000..a73778414b
--- /dev/null
+++ b/packages/coding-standard/tests/Fixer/ConstantNotation/RemoveSlashFromNativeConstantFixer/Fixture/fix_bool_and_null.php.inc
@@ -0,0 +1,29 @@
+<?php
+
+namespace Symplify\CodingStandard\Tests\Fixer\ConstantNotation\RemoveSlashFromNativeConstantFixer\Fixture;
+
+function fixBoolAndNull()
+{
+    if (\true) {
+        return \false;
+    }
+
+    return \null;
+}
+
+?>
+-----
+<?php
+
+namespace Symplify\CodingStandard\Tests\Fixer\ConstantNotation\RemoveSlashFromNativeConstantFixer\Fixture;
+
+function fixBoolAndNull()
+{
+    if (true) {
+        return false;
+    }
+
+    return null;
+}
+
+?>
diff --git a/packages/coding-standard/tests/Fixer/ConstantNotation/RemoveSlashFromNativeConstantFixer/Fixture/keep_casing.php.inc b/packages/coding-standard/tests/Fixer/ConstantNotation/RemoveSlashFromNativeConstantFixer/Fixture/keep_casing.php.inc
new file mode 100644
index 0000000000..8b891f1874
--- /dev/null
+++ b/packages/coding-standard/tests/Fixer/ConstantNotation/RemoveSlashFromNativeConstantFixer/Fixture/keep_casing.php.inc
@@ -0,0 +1,17 @@
+<?php
+
+namespace Symplify\CodingStandard\Tests\Fixer\ConstantNotation\RemoveSlashFromNativeConstantFixer\Fixture;
+
+$value = \TRUE;
+$other = \Null;
+
+?>
+-----
+<?php
+
+namespace Symplify\CodingStandard\Tests\Fixer\ConstantNotation\RemoveSlashFromNativeConstantFixer\Fixture;
+
+$value = TRUE;
+$other = Null;
+
+?>
diff --git a/packages/coding-standard/tests/Fixer/ConstantNotation/RemoveSlashFromNativeConstantFixer/Fixture/skip_namespace_segment.php.inc b/packages/coding-standard/tests/Fixer/ConstantNotation/RemoveSlashFromNativeConstantFixer/Fixture/skip_namespace_segment.php.inc
new file mode 100644
index 0000000000..043dcc82e8
--- /dev/null
+++ b/packages/coding-standard/tests/Fixer/ConstantNotation/RemoveSlashFromNativeConstantFixer/Fixture/skip_namespace_segment.php.inc
@@ -0,0 +1,10 @@
+<?php
+
+namespace Symplify\CodingStandard\Tests\Fixer\ConstantNotation\RemoveSlashFromNativeConstantFixer\Fixture;
+
+use Some\True\Value;
+
+function skipNamespaceSegment()
+{
+    return Some\True\Value::NAME;
+}
diff --git a/packages/coding-standard/tests/Fixer/ConstantNotation/RemoveSlashFromNativeConstantFixer/RemoveSlashFromNativeConstantFixerTest.php b/packages/coding-standard/tests/Fixer/ConstantNotation/RemoveSlashFromNativeConstantFixer/RemoveSlashFromNativeConstantFixerTest.php
new file mode 100644
index 0000000000..7fc9124705
--- /dev/null
+++ b/packages/coding-standard/tests/Fixer/ConstantNotation/RemoveSlashFromNativeConstantFixer/RemoveSlashFromNativeConstantFixerTest.php
@@ -0,0 +1,28 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Symplify\CodingStandard\Tests\Fixer\ConstantNotation\RemoveSlashFromNativeConstantFixer;
+
+use Iterator;
+use PHPUnit\Framework\Attributes\DataProvider;
+use Symplify\EasyCodingStandard\Testing\PHPUnit\AbstractCheckerTestCase;
+
+final class RemoveSlashFromNativeConstantFixerTest extends AbstractCheckerTestCase
+{
+    #[DataProvider('provideData')]
+    public function test(string $filePath): void
+    {
+        $this->doTestFile($filePath);
+    }
+
+    public static function provideData(): Iterator
+    {
+        return self::yieldFiles(__DIR__ . '/Fixture');
+    }
+
+    public function provideConfig(): string
+    {
+        return __DIR__ . '/config/configured_rule.php';
+    }
+}
diff --git a/packages/coding-standard/tests/Fixer/ConstantNotation/RemoveSlashFromNativeConstantFixer/config/configured_rule.php b/packages/coding-standard/tests/Fixer/ConstantNotation/RemoveSlashFromNativeConstantFixer/config/configured_rule.php
new file mode 100644
index 0000000000..f18f957be6
--- /dev/null
+++ b/packages/coding-standard/tests/Fixer/ConstantNotation/RemoveSlashFromNativeConstantFixer/config/configured_rule.php
@@ -0,0 +1,10 @@
+<?php
+
+declare(strict_types=1);
+
+use Symplify\CodingStandard\Fixer\ConstantNotation\RemoveSlashFromNativeConstantFixer;
+use Symplify\EasyCodingStandard\Config\ECSConfig;
+
+return static function (ECSConfig $ecsConfig): void {
+    $ecsConfig->rule(RemoveSlashFromNativeConstantFixer::class);
+};