diff --git a/src/Symfony/Component/Ldap/Entry.php b/src/Symfony/Component/Ldap/Entry.php
index da3b8bb74ef41..1a156e5f2280c 100644
--- a/src/Symfony/Component/Ldap/Entry.php
+++ b/src/Symfony/Component/Ldap/Entry.php
@@ -13,16 +13,23 @@
 
 /**
  * @author Charles Sarrazin <charles@sarraz.in>
+ * @author Karl Shea <karl@karlshea.com>
  */
 class Entry
 {
     private $dn;
     private $attributes;
+    private $lowerMap;
 
     public function __construct(string $dn, array $attributes = [])
     {
         $this->dn = $dn;
-        $this->attributes = $attributes;
+        $this->attributes = [];
+        $this->lowerMap = [];
+
+        foreach ($attributes as $key => $attribute) {
+            $this->setAttribute($key, $attribute);
+        }
     }
 
     /**
@@ -38,13 +45,20 @@ public function getDn()
     /**
      * Returns whether an attribute exists.
      *
-     * @param string $name The name of the attribute
+     * @param string $name          The name of the attribute
+     * @param bool   $caseSensitive Whether the check should be case-sensitive
      *
      * @return bool
      */
-    public function hasAttribute(string $name)
+    public function hasAttribute(string $name, $caseSensitive = true)
     {
-        return isset($this->attributes[$name]);
+        $attributeKey = $this->getAttributeKey($name, $caseSensitive);
+
+        if (null === $attributeKey) {
+            return false;
+        }
+
+        return isset($this->attributes[$attributeKey]);
     }
 
     /**
@@ -53,13 +67,20 @@ public function hasAttribute(string $name)
      * As LDAP can return multiple values for a single attribute,
      * this value is returned as an array.
      *
-     * @param string $name The name of the attribute
+     * @param string $name          The name of the attribute
+     * @param bool   $caseSensitive Whether the attribute name is case-sensitive
      *
      * @return array|null
      */
-    public function getAttribute(string $name)
+    public function getAttribute(string $name, $caseSensitive = true)
     {
-        return isset($this->attributes[$name]) ? $this->attributes[$name] : null;
+        $attributeKey = $this->getAttributeKey($name, $caseSensitive);
+
+        if (null === $attributeKey) {
+            return null;
+        }
+
+        return $this->attributes[$attributeKey] ?? null;
     }
 
     /**
@@ -78,6 +99,7 @@ public function getAttributes()
     public function setAttribute(string $name, array $value)
     {
         $this->attributes[$name] = $value;
+        $this->lowerMap[strtolower($name)] = $name;
     }
 
     /**
@@ -86,5 +108,21 @@ public function setAttribute(string $name, array $value)
     public function removeAttribute(string $name)
     {
         unset($this->attributes[$name]);
+        unset($this->lowerMap[strtolower($name)]);
+    }
+
+    /**
+     * Get the attribute key.
+     *
+     * @param string $name          The attribute name
+     * @param bool   $caseSensitive Whether the attribute name is case-sensitive
+     */
+    private function getAttributeKey(string $name, bool $caseSensitive = true): ?string
+    {
+        if ($caseSensitive) {
+            return $name;
+        }
+
+        return $this->lowerMap[strtolower($name)] ?? null;
     }
 }
diff --git a/src/Symfony/Component/Ldap/Tests/EntryTest.php b/src/Symfony/Component/Ldap/Tests/EntryTest.php
new file mode 100644
index 0000000000000..7185db1040281
--- /dev/null
+++ b/src/Symfony/Component/Ldap/Tests/EntryTest.php
@@ -0,0 +1,42 @@
+<?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\Component\Ldap\Tests;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\Ldap\Entry;
+
+class EntryTest extends TestCase
+{
+    public function testCaseSensitiveAttributeAccessors()
+    {
+        $mail = 'fabpot@symfony.com';
+        $givenName = 'Fabien Potencier';
+
+        $entry = new Entry('cn=fabpot,dc=symfony,dc=com', [
+            'mail' => [$mail],
+            'givenName' => [$givenName],
+        ]);
+
+        $this->assertFalse($entry->hasAttribute('givenname'));
+        $this->assertTrue($entry->hasAttribute('givenname', false));
+
+        $this->assertNull($entry->getAttribute('givenname'));
+        $this->assertSame($givenName, $entry->getAttribute('givenname', false)[0]);
+
+        $firstName = 'Fabien';
+
+        $entry->setAttribute('firstName', [$firstName]);
+        $this->assertSame($firstName, $entry->getAttribute('firstname', false)[0]);
+        $entry->removeAttribute('firstName');
+        $this->assertFalse($entry->hasAttribute('firstname', false));
+    }
+}

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