diff --git a/config/set/php85.php b/config/set/php85.php
index a5a49624beb..19715d7a0c2 100644
--- a/config/set/php85.php
+++ b/config/set/php85.php
@@ -12,6 +12,7 @@
 use Rector\Php85\Rector\Const_\DeprecatedAnnotationToDeprecatedAttributeRector;
 use Rector\Php85\Rector\FuncCall\ArrayKeyExistsNullToEmptyStringRector;
 use Rector\Php85\Rector\FuncCall\ChrArgModuloRector;
+use Rector\Php85\Rector\FuncCall\OrdSingleByteRector;
 use Rector\Php85\Rector\FuncCall\RemoveFinfoBufferContextArgRector;
 use Rector\Php85\Rector\Switch_\ColonAfterSwitchCaseRector;
 use Rector\Removing\Rector\FuncCall\RemoveFuncCallArgRector;
@@ -37,6 +38,7 @@
             ColonAfterSwitchCaseRector::class,
             ArrayKeyExistsNullToEmptyStringRector::class,
             ChrArgModuloRector::class,
+            OrdSingleByteRector::class,
         ]
     );
 
diff --git a/rules-tests/Php85/Rector/FuncCall/OrdSingleByteRector/Fixture/multibyte_int.php.inc b/rules-tests/Php85/Rector/FuncCall/OrdSingleByteRector/Fixture/multibyte_int.php.inc
new file mode 100644
index 00000000000..aaffcdbfa77
--- /dev/null
+++ b/rules-tests/Php85/Rector/FuncCall/OrdSingleByteRector/Fixture/multibyte_int.php.inc
@@ -0,0 +1,9 @@
+<?php 
+namespace Rector\Tests\Php85\Rector\FuncCall\OrdSingleByteRector\Fixture;
+echo ord(123);
+?>
+-----
+<?php 
+namespace Rector\Tests\Php85\Rector\FuncCall\OrdSingleByteRector\Fixture;
+echo ord(1);
+?>
\ No newline at end of file
diff --git a/rules-tests/Php85/Rector/FuncCall/OrdSingleByteRector/Fixture/multibyte_str.php.inc b/rules-tests/Php85/Rector/FuncCall/OrdSingleByteRector/Fixture/multibyte_str.php.inc
new file mode 100644
index 00000000000..af2fe155cb8
--- /dev/null
+++ b/rules-tests/Php85/Rector/FuncCall/OrdSingleByteRector/Fixture/multibyte_str.php.inc
@@ -0,0 +1,11 @@
+<?php 
+namespace Rector\Tests\Php85\Rector\FuncCall\OrdSingleByteRector\Fixture;
+$a = 'abc';
+echo ord($a);
+?>
+-----
+<?php 
+namespace Rector\Tests\Php85\Rector\FuncCall\OrdSingleByteRector\Fixture;
+$a = 'abc';
+echo ord($a[0]);
+?>
\ No newline at end of file
diff --git a/rules-tests/Php85/Rector/FuncCall/OrdSingleByteRector/Fixture/skip_bool.php.inc b/rules-tests/Php85/Rector/FuncCall/OrdSingleByteRector/Fixture/skip_bool.php.inc
new file mode 100644
index 00000000000..db18509cbdf
--- /dev/null
+++ b/rules-tests/Php85/Rector/FuncCall/OrdSingleByteRector/Fixture/skip_bool.php.inc
@@ -0,0 +1,5 @@
+<?php 
+namespace Rector\Tests\Php85\Rector\FuncCall\OrdSingleByteRector\Fixture;
+$a = true;
+echo ord($a);
+?>
\ No newline at end of file
diff --git a/rules-tests/Php85/Rector/FuncCall/OrdSingleByteRector/Fixture/skip_multibyte_int_var.php.inc b/rules-tests/Php85/Rector/FuncCall/OrdSingleByteRector/Fixture/skip_multibyte_int_var.php.inc
new file mode 100644
index 00000000000..7cc95c53a58
--- /dev/null
+++ b/rules-tests/Php85/Rector/FuncCall/OrdSingleByteRector/Fixture/skip_multibyte_int_var.php.inc
@@ -0,0 +1,5 @@
+<?php 
+namespace Rector\Tests\Php85\Rector\FuncCall\OrdSingleByteRector\Fixture;
+$i = 123;
+echo ord($i);
+?>
\ No newline at end of file
diff --git a/rules-tests/Php85/Rector/FuncCall/OrdSingleByteRector/OrdSingleByteRectorTest.php b/rules-tests/Php85/Rector/FuncCall/OrdSingleByteRector/OrdSingleByteRectorTest.php
new file mode 100644
index 00000000000..a9db1796a52
--- /dev/null
+++ b/rules-tests/Php85/Rector/FuncCall/OrdSingleByteRector/OrdSingleByteRectorTest.php
@@ -0,0 +1,28 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Rector\Tests\Php85\Rector\FuncCall\OrdSingleByteRector;
+
+use Iterator;
+use PHPUnit\Framework\Attributes\DataProvider;
+use Rector\Testing\PHPUnit\AbstractRectorTestCase;
+
+final class OrdSingleByteRectorTest extends AbstractRectorTestCase
+{
+    #[DataProvider('provideData')]
+    public function test(string $filePath): void
+    {
+        $this->doTestFile($filePath);
+    }
+
+    public static function provideData(): Iterator
+    {
+        return self::yieldFilesFromDirectory(__DIR__ . '/Fixture');
+    }
+
+    public function provideConfigFilePath(): string
+    {
+        return __DIR__ . '/config/configured_rule.php';
+    }
+}
diff --git a/rules-tests/Php85/Rector/FuncCall/OrdSingleByteRector/config/configured_rule.php b/rules-tests/Php85/Rector/FuncCall/OrdSingleByteRector/config/configured_rule.php
new file mode 100644
index 00000000000..6989be8e1f1
--- /dev/null
+++ b/rules-tests/Php85/Rector/FuncCall/OrdSingleByteRector/config/configured_rule.php
@@ -0,0 +1,13 @@
+<?php
+
+declare(strict_types=1);
+
+use Rector\Config\RectorConfig;
+use Rector\Php85\Rector\FuncCall\OrdSingleByteRector;
+use Rector\ValueObject\PhpVersion;
+
+return static function (RectorConfig $rectorConfig): void {
+    $rectorConfig->rule(OrdSingleByteRector::class);
+
+    $rectorConfig->phpVersion(PhpVersion::PHP_85);
+};
diff --git a/rules/Php85/Rector/FuncCall/OrdSingleByteRector.php b/rules/Php85/Rector/FuncCall/OrdSingleByteRector.php
new file mode 100644
index 00000000000..d1219b039b6
--- /dev/null
+++ b/rules/Php85/Rector/FuncCall/OrdSingleByteRector.php
@@ -0,0 +1,110 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Rector\Php85\Rector\FuncCall;
+
+use PhpParser\Node;
+use PhpParser\Node\Expr\ArrayDimFetch;
+use PhpParser\Node\Expr\FuncCall;
+use PhpParser\Node\Scalar\Int_;
+use PhpParser\Node\Scalar\String_;
+use Rector\PhpParser\Node\Value\ValueResolver;
+use Rector\Rector\AbstractRector;
+use Rector\ValueObject\PhpVersionFeature;
+use Rector\VersionBonding\Contract\MinPhpVersionInterface;
+use Symplify\RuleDocGenerator\ValueObject\CodeSample\CodeSample;
+use Symplify\RuleDocGenerator\ValueObject\RuleDefinition;
+
+/**
+ * @see https://wiki.php.net/rfc/deprecations_php_8_5#deprecate_passing_string_which_are_not_one_byte_long_to_ord
+ * @see \Rector\Tests\Php85\Rector\FuncCall\OrdSingleByteRector\OrdSingleByteRectorTest
+ */
+final class OrdSingleByteRector extends AbstractRector implements MinPhpVersionInterface
+{
+    public function __construct(
+        private readonly ValueResolver $valueResolver
+    ) {
+
+    }
+
+    public function getRuleDefinition(): RuleDefinition
+    {
+        return new RuleDefinition(
+            'Replace ord($str) with ord($str[0])',
+            [
+                new CodeSample(
+                    <<<'CODE_SAMPLE'
+echo ord('abc');
+CODE_SAMPLE
+                    ,
+                    <<<'CODE_SAMPLE'
+echo ord('a');
+CODE_SAMPLE
+                ),
+            ]
+        );
+    }
+
+    public function getNodeTypes(): array
+    {
+        return [FuncCall::class];
+    }
+
+    /**
+     * @param FuncCall $node
+     */
+    public function refactor(Node $node): ?Node
+    {
+        if ($node->isFirstClassCallable()) {
+            return null;
+        }
+
+        if (! $this->isName($node, 'ord')) {
+            return null;
+        }
+
+        $args = $node->getArgs();
+
+        if (! isset($node->args[0])) {
+            return null;
+        }
+
+        $argExpr = $args[0]->value;
+        $type = $this->nodeTypeResolver->getNativeType($argExpr);
+
+        if (! $type->isString()->yes() && ! $type->isInteger()->yes()) {
+            return null;
+        }
+
+        $value = $this->valueResolver->getValue($argExpr);
+        $isInt = is_int($value);
+
+        if (! $argExpr instanceof Int_) {
+
+            if ($isInt) {
+                return null;
+            }
+
+            $args[0]->value = new ArrayDimFetch($argExpr, new Int_(0));
+            $node->args = $args;
+
+            return $node;
+        }
+
+        $value = (string) $value;
+        $byte = $value[0] ?? '';
+
+        $byteValue = $isInt ? new Int_((int) $byte) : new String_($byte);
+
+        $args[0]->value = $byteValue;
+        $node->args = $args;
+
+        return $node;
+    }
+
+    public function provideMinPhpVersion(): int
+    {
+        return PhpVersionFeature::DEPRECATE_ORD_WITH_MULTIBYTE_STRING;
+    }
+}
diff --git a/src/ValueObject/PhpVersionFeature.php b/src/ValueObject/PhpVersionFeature.php
index cf0b48bd481..087d11985a2 100644
--- a/src/ValueObject/PhpVersionFeature.php
+++ b/src/ValueObject/PhpVersionFeature.php
@@ -810,4 +810,10 @@ final class PhpVersionFeature
      * @var int
      */
     public const DEPRECATE_OUTSIDE_INTERVEL_VAL_IN_CHR_FUNCTION = PhpVersion::PHP_85;
+    
+    /**
+     * @see https://wiki.php.net/rfc/deprecations_php_8_5#deprecate_passing_string_which_are_not_one_byte_long_to_ord
+     * @var int
+     */
+    public const DEPRECATE_ORD_WITH_MULTIBYTE_STRING = PhpVersion::PHP_85;
 }