diff --git a/core/includes/common.inc b/core/includes/common.inc
index f954b20..3d349c1 100644
--- a/core/includes/common.inc
+++ b/core/includes/common.inc
@@ -279,6 +279,24 @@ function drupal_get_profile() {
   return $profile;
 }
 
+/**
+ * Returns a list of related installation profiles in descending order of their
+ * dependencies.
+ */
+function drupal_get_profiles($profile) {
+  if (!function_exists('install_get_base_profiles')) {
+    require_once DRUPAL_ROOT . '/core/includes/install.inc';
+  }
+
+  $profiles = array();
+
+  if (!empty($profile)) {
+    $profiles = array_reverse(install_get_base_profiles($profile));
+    $profiles[] = $profile;
+  }
+
+  return $profiles;
+}
 
 /**
  * Sets the breadcrumb trail for the current page.
diff --git a/core/includes/install.core.inc b/core/includes/install.core.inc
index 8e4b66e..8451086 100644
--- a/core/includes/install.core.inc
+++ b/core/includes/install.core.inc
@@ -195,6 +195,9 @@ function install_state_defaults() {
     // An array of information about the chosen installation profile. This will
     // be filled in based on the profile's .info.yml file.
     'profile_info' => array(),
+    // An array of information for each of the base profiles of the chosen
+    // installation profile.
+    'base_profiles_info' => array(),
     // An array of available installation profiles.
     'profiles' => array(),
     // An array of server variables that will be substituted into the global
@@ -796,16 +799,17 @@ function install_tasks($install_state) {
   if (!empty($install_state['parameters']['profile'])) {
     // Load the profile install file, because it is not always loaded when
     // hook_install_tasks() is invoked (e.g. batch processing).
-    $profile = $install_state['parameters']['profile'];
-    $profile_install_file = dirname($install_state['profiles'][$profile]->uri) . '/' . $profile . '.install';
-    if (file_exists($profile_install_file)) {
-      include_once $profile_install_file;
-    }
-    $function = $install_state['parameters']['profile'] . '_install_tasks';
-    if (function_exists($function)) {
-      $result = $function($install_state);
-      if (is_array($result)) {
-        $tasks += $result;
+    foreach (drupal_get_profiles($install_state['parameters']['profile']) as $profile) {
+      $profile_install_file = dirname($install_state['profiles'][$profile]->uri) . '/' . $profile . '.install';
+      if (file_exists($profile_install_file)) {
+        include_once $profile_install_file;
+      }
+      $function = $profile . '_install_tasks';
+      if (function_exists($function)) {
+        $result = $function($install_state);
+        if (is_array($result)) {
+          $tasks += $result;
+        }
       }
     }
   }
@@ -831,13 +835,14 @@ function install_tasks($install_state) {
 
   // Allow the installation profile to modify the full list of tasks.
   if (!empty($install_state['parameters']['profile'])) {
-    $profile = $install_state['parameters']['profile'];
-    $profile_file = $install_state['profiles'][$profile]->uri;
-    if (file_exists($profile_file)) {
-      include_once $profile_file;
-      $function = $install_state['parameters']['profile'] . '_install_tasks_alter';
-      if (function_exists($function)) {
-        $function($tasks, $install_state);
+    foreach (drupal_get_profiles($install_state['parameters']['profile']) as $profile) {
+      $profile_file = $install_state['profiles'][$profile]->uri;
+      if (file_exists($profile_file)) {
+        include_once $profile_file;
+        $function = $profile . '_install_tasks_alter';
+        if (function_exists($function)) {
+          $function($tasks, $install_state);
+        }
       }
     }
   }
@@ -999,11 +1004,19 @@ function install_base_system(&$install_state) {
 
   // Save the list of other modules to install for the upcoming tasks.
   // variable_set() can be used now that system.module is installed.
-  $modules = $install_state['profile_info']['dependencies'];
+  $profiles = drupal_get_profiles($install_state['parameters']['profile']);
+  $profile_dependencies = array();
+
+  foreach ($profiles as $profile) {
+    $info = install_profile_info($profile);
+    $profile_dependencies = array_unique(array_merge($profile_dependencies, $info['dependencies']));
+  }
+
+  $modules = $profile_dependencies;
 
   // The installation profile is also a module, which needs to be installed
   // after all the dependencies have been installed.
-  $modules[] = drupal_get_profile();
+  $modules = array_merge($modules, $profiles);
 
   Drupal::state()->set('install_profile_modules', array_diff($modules, array('system')));
   $install_state['database_tables_exist'] = TRUE;
@@ -1740,14 +1753,21 @@ function install_already_done_error() {
  *   the profile cannot be loaded.
  */
 function install_load_profile(&$install_state) {
-  $profile = $install_state['parameters']['profile'];
-  $profile_file = $install_state['profiles'][$profile]->uri;
-  if (file_exists($profile_file)) {
-    include_once $profile_file;
-    $install_state['profile_info'] = install_profile_info($install_state['parameters']['profile'], $install_state['parameters']['langcode']);
-  }
-  else {
-    throw new Exception(t('Sorry, the profile you have chosen cannot be loaded.'));
+  foreach (drupal_get_profiles($install_state['parameters']['profile']) as $profile) {
+    $profile_file = $install_state['profiles'][$profile]->uri;
+    if (file_exists($profile_file)) {
+      include_once $profile_file;
+
+      if ($profile == $install_state['parameters']['profile']) {
+        $install_state['profile_info'] = install_profile_info($profile, $install_state['parameters']['langcode']);
+      }
+      else {
+       $install_state['base_profiles_info'][] = install_profile_info($profile, $install_state['parameters']['langcode']);
+      }
+    }
+    else {
+      throw new Exception(t('Sorry, the profile you have chosen cannot be loaded.'));
+    }
   }
 }
 
@@ -1784,7 +1804,9 @@ function install_profile_modules(&$install_state) {
   // Although the profile module is marked as required, it needs to go after
   // every dependency, including non-required ones. So clear its required
   // flag for now to allow it to install late.
-  $files[$install_state['parameters']['profile']]->info['required'] = FALSE;
+  foreach (drupal_get_profiles($install_state['parameters']['profile']) as $profile) {
+    $files[$profile]->info['required'] = FALSE;
+  }
   // Add modules that other modules depend on.
   foreach ($modules as $module) {
     if ($files[$module]->requires) {
diff --git a/core/includes/install.inc b/core/includes/install.inc
index c308a2d..06f76cf 100644
--- a/core/includes/install.inc
+++ b/core/includes/install.inc
@@ -569,10 +569,23 @@ function drupal_verify_profile($install_state) {
   include_once __DIR__ . '/file.inc';
   include_once __DIR__ . '/common.inc';
 
-  $profile = $install_state['parameters']['profile'];
-  $profile_file = $install_state['profiles'][$profile]->uri;
+  $selected_profile = $install_state['parameters']['profile'];
+  $profiles = drupal_get_profiles($selected_profile);
 
-  if (!isset($profile) || !file_exists($profile_file)) {
+  if (!empty($profiles)) {
+    $profile_dependencies = array();
+
+    foreach ($profiles as $profile) {
+      $profile_file = $install_state['profiles'][$profile]->uri;
+
+      if (!file_exists($profile_file)) {
+        throw new Exception(install_no_profile_error());
+      }
+      $info = install_profile_info($profile);
+      $profile_dependencies = array_unique(array_merge($profile_dependencies, $info['dependencies']));
+    }
+  }
+  else {
     throw new Exception(install_no_profile_error());
   }
   $info = $install_state['profile_info'];
@@ -585,10 +598,10 @@ function drupal_verify_profile($install_state) {
 
   // The installation profile is also a module, which needs to be installed
   // after all the other dependencies have been installed.
-  $present_modules[] = drupal_get_profile();
+  $present_modules = array_merge($present_modules, $profiles);
 
   // Verify that all of the profile's required modules are present.
-  $missing_modules = array_diff($info['dependencies'], $present_modules);
+  $missing_modules = array_diff($profile_dependencies, $present_modules);
 
   $requirements = array();
 
@@ -942,23 +955,35 @@ function drupal_requirements_url($severity) {
 function drupal_check_profile($profile, array $install_state) {
   include_once __DIR__ . '/file.inc';
 
-  $profile_file = $install_state['profiles'][$profile]->uri;
+  $requirements = array();
+  if (isset($profile)) {
+    $profile_dependencies = array();
 
-  if (!isset($profile) || !file_exists($profile_file)) {
-    throw new Exception(install_no_profile_error());
-  }
+    // Loop through all active installation profiles to collect dependencies.
+    foreach (drupal_get_profiles($profile) as $profile) {
+      $profile_file = $install_state['profiles'][$profile]->uri;
 
-  $info = install_profile_info($profile);
+      if (!file_exists($profile_file)) {
+        throw new Exception(install_no_profile_error());
+      }
 
-  // Collect requirement testing results.
-  $requirements = array();
-  foreach ($info['dependencies'] as $module) {
-    module_load_install($module);
-    $function = $module . '_requirements';
-    if (function_exists($function)) {
-      $requirements = array_merge($requirements, $function('install'));
+      $info = install_profile_info($profile);
+      $profile_dependencies = array_unique(array_merge($profile_dependencies, $info['dependencies']));
+    }
+
+    // Collect requirement testing results.
+    foreach ($profile_dependencies as $module) {
+      module_load_install($module);
+      $function = $module . '_requirements';
+      if (function_exists($function)) {
+        $requirements = array_merge($requirements, $function('install'));
+      }
     }
   }
+  else {
+    throw new Exception(install_no_profile_error());
+  }
+
   return $requirements;
 }
 
@@ -1086,6 +1111,31 @@ function install_profile_info($profile, $langcode = 'en') {
 }
 
 /**
+ * Returns a list of base installation profiles associated with the specified
+ * installation profile.
+ *
+ * @return
+ *   An array of profile names. An empty array if installation profile has no
+ *   parent profiles.
+ */
+function install_get_base_profiles($profile) {
+  $cache = &drupal_static(__FUNCTION__, array());
+
+  if (!isset($cache[$profile])) {
+    $profile_file = drupal_get_path('profile', $profile) . "/$profile.info";
+    $info = drupal_parse_info_file($profile_file);
+    $cache[$profile] = array();
+
+    while (!empty($info) && isset($info['base'])) {
+      $cache[$profile][] = $info['base'];
+      $info = install_profile_info($info['base']);
+    }
+  }
+
+  return $cache[$profile];
+}
+
+/**
  * Ensures the environment for a Drupal database on a predefined connection.
  *
  * This will run tasks that check that Drupal can perform all of the functions
diff --git a/core/includes/module.inc b/core/includes/module.inc
index 1a32c09..838bbd9 100644
--- a/core/includes/module.inc
+++ b/core/includes/module.inc
@@ -300,7 +300,7 @@ function drupal_required_modules() {
   $required = array();
 
   // An installation profile is required and one must always be loaded.
-  $required[] = drupal_get_profile();
+  $required = array_merge($required, drupal_get_profiles(drupal_get_profile()));
 
   foreach ($files as $name => $file) {
     $info = drupal_parse_info_file($file->uri);
diff --git a/core/lib/Drupal/Core/Extension/ModuleHandler.php b/core/lib/Drupal/Core/Extension/ModuleHandler.php
index b9e5724..61573ba 100644
--- a/core/lib/Drupal/Core/Extension/ModuleHandler.php
+++ b/core/lib/Drupal/Core/Extension/ModuleHandler.php
@@ -695,7 +695,7 @@ function disable($module_list, $disable_dependents = TRUE) {
       // Create an associative array with weights as values.
       $module_list = array_flip(array_values($module_list));
 
-      $profile = drupal_get_profile();
+      $profiles = drupal_get_profiles(drupal_get_profile());
       while (list($module) = each($module_list)) {
         if (!isset($module_data[$module]) || !$module_data[$module]->status) {
           // This module doesn't exist or is already disabled, skip it.
@@ -707,7 +707,7 @@ function disable($module_list, $disable_dependents = TRUE) {
         // Add dependent modules to the list, with a placeholder weight.
         // The new modules will be processed as the while loop continues.
         foreach ($module_data[$module]->required_by as $dependent => $dependent_data) {
-          if (!isset($module_list[$dependent]) && $dependent != $profile) {
+          if (!isset($module_list[$dependent]) && !in_array($dependent, $profiles)) {
             $module_list[$dependent] = 0;
           }
         }
@@ -785,7 +785,7 @@ public function uninstall($module_list = array(), $uninstall_dependents = TRUE)
       // Create an associative array with weights as values.
       $module_list = array_flip(array_values($module_list));
 
-      $profile = drupal_get_profile();
+      $profiles = drupal_get_profiles(drupal_get_profile());
       while (list($module) = each($module_list)) {
         if (!isset($module_data[$module]) || drupal_get_installed_schema_version($module) == SCHEMA_UNINSTALLED) {
           // This module doesn't exist or is already uninstalled. Skip it.
@@ -799,7 +799,7 @@ public function uninstall($module_list = array(), $uninstall_dependents = TRUE)
         // them automatically because uninstalling a module is a destructive
         // operation.
         foreach (array_keys($module_data[$module]->required_by) as $dependent) {
-          if (!isset($module_list[$dependent]) && drupal_get_installed_schema_version($dependent) != SCHEMA_UNINSTALLED && $dependent != $profile) {
+          if (!isset($module_list[$dependent]) && drupal_get_installed_schema_version($dependent) != SCHEMA_UNINSTALLED && !in_array($dependent, $profiles)) {
             return FALSE;
           }
         }
diff --git a/core/modules/system/lib/Drupal/system/Form/ModulesUninstallForm.php b/core/modules/system/lib/Drupal/system/Form/ModulesUninstallForm.php
index a6b3dea..286f40a 100644
--- a/core/modules/system/lib/Drupal/system/Form/ModulesUninstallForm.php
+++ b/core/modules/system/lib/Drupal/system/Form/ModulesUninstallForm.php
@@ -107,7 +107,7 @@ public function buildForm(array $form, array &$form_state, Request $request = NU
       return $form;
     }
 
-    $profile = drupal_get_profile();
+    $profiles = drupal_get_profiles(drupal_get_profile());
 
     // Sort all modules by their name.
     $this->moduleHandler->loadInclude('system', 'inc', 'system.admin');
@@ -130,7 +130,7 @@ public function buildForm(array $form, array &$form_state, Request $request = NU
       // we can allow this module to be uninstalled. (The installation profile
       // is excluded from this list.)
       foreach (array_keys($module->required_by) as $dependent) {
-        if ($dependent != $profile && drupal_get_installed_schema_version($dependent) != SCHEMA_UNINSTALLED) {
+        if (!in_array($dependent, $profiles) && drupal_get_installed_schema_version($dependent) != SCHEMA_UNINSTALLED) {
           $name = isset($modules[$dependent]->info['name']) ? $modules[$dependent]->info['name'] : $dependent;
           $form['modules'][$module->name]['#dependents'][] = $name;
           $form['uninstall'][$module->name]['#disabled'] = TRUE;
diff --git a/core/modules/system/system.install b/core/modules/system/system.install
index 3f0fac0..1fd62d9 100644
--- a/core/modules/system/system.install
+++ b/core/modules/system/system.install
@@ -445,11 +445,11 @@ function system_requirements($phase) {
 
   // Display an error if a newly introduced dependency in a module is not resolved.
   if ($phase == 'update') {
-    $profile = drupal_get_profile();
+    $profiles = drupal_get_profiles(drupal_get_profile());
     $files = system_rebuild_module_data();
     foreach ($files as $module => $file) {
       // Ignore disabled modules and installation profiles.
-      if (!$file->status || $module == $profile) {
+      if (!$file->status || in_array($module, $profiles)) {
         continue;
       }
       // Check the module's PHP version.
diff --git a/core/modules/system/system.module b/core/modules/system/system.module
index 6a8478f..9a6cb4c 100644
--- a/core/modules/system/system.module
+++ b/core/modules/system/system.module
@@ -2499,12 +2499,17 @@ function _system_rebuild_module_data() {
   // Find installation profiles.
   $profiles = drupal_system_listing('/^' . DRUPAL_PHP_FUNCTION_PATTERN . '\.profile$/', 'profiles', 'name', 0);
 
-  // Include the installation profile in modules that are loaded.
-  $profile = drupal_get_profile();
-  $modules[$profile] = $profiles[$profile];
+  // Include the active installation profile(s) in modules that are loaded.
+  $profile_weight = 1000;
+  $base_profiles = drupal_get_profiles(drupal_get_profile());
 
   // Installation profile hooks are always executed last.
-  $modules[$profile]->weight = 1000;
+  foreach ($base_profiles as $profile) {
+    $modules[$profile] = $profiles[$profile];
+
+    // Installation profile hooks are always executed last.
+    $modules[$profile]->weight = $profile_weight++;
+  }
 
   // Set defaults for module info.
   $defaults = array(
@@ -2540,7 +2545,7 @@ function _system_rebuild_module_data() {
 
     // Installation profiles are hidden by default, unless explicitly specified
     // otherwise in the .info.yml file.
-    if ($key == $profile && !isset($modules[$key]->info['hidden'])) {
+    if (in_array($key, $profiles) && !isset($modules[$key]->info['hidden'])) {
       $modules[$key]->info['hidden'] = TRUE;
     }
 
@@ -2550,13 +2555,15 @@ function _system_rebuild_module_data() {
     drupal_alter('system_info', $modules[$key]->info, $modules[$key], $type);
   }
 
-  if (isset($modules[$profile])) {
-    // The installation profile is required, if it's a valid module.
-    $modules[$profile]->info['required'] = TRUE;
-    // Add a default distribution name if the profile did not provide one. This
-    // matches the default value used in install_profile_info().
-    if (!isset($modules[$profile]->info['distribution_name'])) {
-      $modules[$profile]->info['distribution_name'] = 'Drupal';
+  foreach ($base_profiles as $profile) {
+    if (isset($modules[$profile])) {
+      // The installation profile is required, if it's a valid module.
+      $modules[$profile]->info['required'] = TRUE;
+      // Add a default distribution name if the profile did not provide one.
+      // This matches the default value used in install_profile_info().
+      if (!isset($modules[$profile]->info['distribution_name'])) {
+        $modules[$profile]->info['distribution_name'] = 'Drupal';
+      }
     }
   }