diff --git a/.upgradenotes/MDL-82747-2024080805044739.yml b/.upgradenotes/MDL-82747-2024080805044739.yml
new file mode 100644
index 00000000000..9ef00af1a94
--- /dev/null
+++ b/.upgradenotes/MDL-82747-2024080805044739.yml
@@ -0,0 +1,10 @@
+issueNumber: MDL-82747
+notes:
+  core:
+    - message: >-
+        The Moodle autoloader should now be registered using
+        `\core\component::register_autoloader` rather than manually doing so in
+        any exceptional location which requires it. It is not normally necessary
+        to include the autoloader manually, as it is registered automatically
+        when the Moodle environment is bootstrapped.
+      type: improved
diff --git a/admin/cli/install.php b/admin/cli/install.php
index 56849ee9523..440a3d7ef87 100644
--- a/admin/cli/install.php
+++ b/admin/cli/install.php
@@ -179,13 +179,8 @@ ini_set('include_path', $CFG->libdir.'/pear' . PATH_SEPARATOR . ini_get('include
 // The core_component class can be used in any scripts, it does not need anything else.
 require_once($CFG->libdir.'/classes/component.php');
 
-// Register our classloader, in theory somebody might want to replace it to load other hacked core classes.
-// Required because the database checks below lead to session interaction which is going to lead us to requiring autoloaded classes.
-if (defined('COMPONENT_CLASSLOADER')) {
-    spl_autoload_register(COMPONENT_CLASSLOADER);
-} else {
-    spl_autoload_register('core_component::classloader');
-}
+// Register our classloader.
+\core\component::register_autoloader();
 
 require_once($CFG->libdir.'/classes/text.php');
 require_once($CFG->libdir.'/classes/string_manager.php');
diff --git a/install.php b/install.php
index a9068ee49a8..17646a4a3b4 100644
--- a/install.php
+++ b/install.php
@@ -202,12 +202,8 @@ if (!empty($memlimit) and $memlimit != -1) {
 // the problem is that we need specific version of quickforms and hacked excel files :-(.
 ini_set('include_path', $CFG->libdir.'/pear' . PATH_SEPARATOR . ini_get('include_path'));
 
-// Register our classloader, in theory somebody might want to replace it to load other hacked core classes.
-if (defined('COMPONENT_CLASSLOADER')) {
-    spl_autoload_register(COMPONENT_CLASSLOADER);
-} else {
-    spl_autoload_register('core_component::classloader');
-}
+// Register our classloader.
+\core\component::register_autoloader();
 
 // Continue with lib loading.
 require_once($CFG->libdir.'/classes/text.php');
diff --git a/lib/classes/component.php b/lib/classes/component.php
index 7da97fbf726..fa4e64daa77 100644
--- a/lib/classes/component.php
+++ b/lib/classes/component.php
@@ -149,6 +149,44 @@ class component {
         \Slim::class => 'lib/slim/slim/Slim',
     ];
 
+    /**
+     *  An array containing files which are normally in a package's composer/autoload.files section.
+     *
+     * PHP does not provide a mechanism for automatically including the files that methods are in.
+     *
+     * The Composer autoloader includes all files in this section of the composer.json file during the instantiation of the loader.
+     *
+     * @var array<string>
+     */
+    protected static $composerautoloadfiles = [
+        'lib/aws-sdk/src/functions.php',
+        'lib/guzzlehttp/guzzle/src/functions_include.php',
+        'lib/jmespath/src/JmesPath.php',
+        'lib/php-di/php-di/src/functions.php',
+        'lib/ralouphi/getallheaders/src/getallheaders.php',
+        'lib/symfony/deprecation-contracts/function.php',
+    ];
+
+    /**
+     * Register the Moodle class autoloader.
+     */
+    public static function register_autoloader(): void {
+        if (defined('COMPONENT_CLASSLOADER')) {
+            spl_autoload_register(COMPONENT_CLASSLOADER);
+        } else {
+            spl_autoload_register([self::class, 'classloader']);
+        }
+
+        // Load any composer-driven autoload files.
+        // This is intended to mimic the behaviour of the standard Composer Autoloader.
+        foreach (static::$composerautoloadfiles as $file) {
+            $path = dirname(__DIR__, 2) . '/' . $file;
+            if (file_exists($path)) {
+                require_once($path);
+            }
+        }
+    }
+
     /**
      * Class loader for Frankenstyle named classes in standard locations.
      * Frankenstyle namespaces are supported.
diff --git a/lib/setup.php b/lib/setup.php
index 1fb63fc3e6f..0a14e5f3981 100644
--- a/lib/setup.php
+++ b/lib/setup.php
@@ -594,12 +594,8 @@ if (NO_OUTPUT_BUFFERING) {
 // the problem is that we need specific version of quickforms and hacked excel files :-(.
 ini_set('include_path', $CFG->libdir . '/pear' . PATH_SEPARATOR . ini_get('include_path'));
 
-// Register our classloader, in theory somebody might want to replace it to load other hacked core classes.
-if (defined('COMPONENT_CLASSLOADER')) {
-    spl_autoload_register(COMPONENT_CLASSLOADER);
-} else {
-    spl_autoload_register([\core_component::class, 'classloader']);
-}
+// Register our classloader.
+\core\component::register_autoloader();
 
 // Special support for highly optimised scripts that do not need libraries and DB connection.
 if (defined('ABORT_AFTER_CONFIG')) {