diff --git a/src/Illuminate/Database/Eloquent/Builder.php b/src/Illuminate/Database/Eloquent/Builder.php
index 77c0bd27d836..4437650016ba 100755
--- a/src/Illuminate/Database/Eloquent/Builder.php
+++ b/src/Illuminate/Database/Eloquent/Builder.php
@@ -742,9 +742,13 @@ public function get($columns = ['*'])
             $models = $builder->eagerLoadRelations($models);
         }
 
-        return $this->applyAfterQueryCallbacks(
-            $builder->getModel()->newCollection($models)
-        );
+        $collection = $builder->getModel()->newCollection($models);
+
+        if (Model::isAutoloadingRelationsGlobally()) {
+            $collection->withRelationAutoload();
+        }
+
+        return $this->applyAfterQueryCallbacks($collection);
     }
 
     /**
diff --git a/src/Illuminate/Database/Eloquent/Collection.php b/src/Illuminate/Database/Eloquent/Collection.php
index 1ae950cb9e73..5cfedc6c212d 100755
--- a/src/Illuminate/Database/Eloquent/Collection.php
+++ b/src/Illuminate/Database/Eloquent/Collection.php
@@ -248,6 +248,31 @@ public function loadMissing($relations)
         return $this;
     }
 
+    /**
+     * Load a relationship path with types if it is not already eager loaded.
+     *
+     * @return void
+     */
+    public function loadMissingRelationWithTypes(array $path)
+    {
+        [$name, $class] = array_shift($path);
+
+        $this->filter(fn ($model) => ! is_null($model) && ! $model->relationLoaded($name) && $model::class === $class)
+            ->load($name);
+
+        if (empty($path)) {
+            return;
+        }
+
+        $models = $this->pluck($name)->whereNotNull();
+
+        if ($models->first() instanceof BaseCollection) {
+            $models = $models->collapse();
+        }
+
+        (new static($models))->loadMissingRelationWithTypes($path);
+    }
+
     /**
      * Load a relationship path if it is not already eager loaded.
      *
@@ -314,6 +339,21 @@ public function loadMorphCount($relation, $relations)
         return $this;
     }
 
+    /**
+     * Enable relation autoload for the collection.
+     *
+     * @return $this
+     */
+    public function withRelationAutoload()
+    {
+        $callback = fn ($path) => $this->loadMissingRelationWithTypes($path);
+
+        $this->each(fn ($model) => $model->hasRelationAutoloadCallback()
+            || $model->usingRelationAutoloadCallback($this, $callback));
+
+        return $this;
+    }
+
     /**
      * Determine if a key exists in the collection.
      *
diff --git a/src/Illuminate/Database/Eloquent/Concerns/HasAttributes.php b/src/Illuminate/Database/Eloquent/Concerns/HasAttributes.php
index c1ddc54c8f4b..5deddd89d9b9 100644
--- a/src/Illuminate/Database/Eloquent/Concerns/HasAttributes.php
+++ b/src/Illuminate/Database/Eloquent/Concerns/HasAttributes.php
@@ -549,6 +549,10 @@ public function getRelationValue($key)
             return;
         }
 
+        if ($this->handleRelationAutoload($key)) {
+            return $this->relations[$key];
+        }
+
         if ($this->preventsLazyLoading) {
             $this->handleLazyLoadingViolation($key);
         }
diff --git a/src/Illuminate/Database/Eloquent/Concerns/HasRelationships.php b/src/Illuminate/Database/Eloquent/Concerns/HasRelationships.php
index c62132a26185..e950fe43d466 100644
--- a/src/Illuminate/Database/Eloquent/Concerns/HasRelationships.php
+++ b/src/Illuminate/Database/Eloquent/Concerns/HasRelationships.php
@@ -39,6 +39,20 @@ trait HasRelationships
      */
     protected $touches = [];
 
+    /**
+     * The relationship autoload callback.
+     *
+     * @var ?Closure
+     */
+    protected $relationAutoloadCallback = null;
+
+    /**
+     * The relationship autoload context.
+     *
+     * @var ?Collection
+     */
+    protected $relationAutoloadContext = null;
+
     /**
      * The many to many relationship methods.
      *
@@ -90,6 +104,132 @@ public static function resolveRelationUsing($name, Closure $callback)
         );
     }
 
+    /**
+     * Set relation autoload callback for model and its relations.
+     *
+     * @param  mixed  $context
+     * @param  Closure  $callback
+     * @return $this
+     */
+    public function usingRelationAutoloadCallback($context, Closure $callback)
+    {
+        $this->relationAutoloadContext = $context;
+        $this->relationAutoloadCallback = $callback;
+
+        foreach ($this->relations as $key => $value) {
+            $this->applyRelationAutoloadCallbackToValue($key, $value);
+        }
+
+        return $this;
+    }
+
+    /**
+     * Get relation autoload context.
+     *
+     * @return mixed
+     */
+    public function getRelationAutoloadContext()
+    {
+        return $this->relationAutoloadContext;
+    }
+
+    /**
+     * Enable relation autoload for model and its relations if not already enabled.
+     *
+     * @return $this
+     */
+    public function withRelationAutoload()
+    {
+        if ($this->hasRelationAutoloadCallback()) {
+            return $this;
+        }
+
+        $collection = new Collection([$this]);
+
+        $this->usingRelationAutoloadCallback(
+            $collection,
+            fn ($path) => $collection->loadMissingRelationWithTypes($path)
+        );
+
+        return $this;
+    }
+
+    /**
+     * Check if relation autoload callback is set.
+     *
+     * @return bool
+     */
+    public function hasRelationAutoloadCallback()
+    {
+        return ! is_null($this->relationAutoloadCallback);
+    }
+
+    /**
+     * Trigger relation autoload callback and check if relation is loaded.
+     *
+     * @param  string  $key
+     * @return bool
+     */
+    protected function handleRelationAutoload($key)
+    {
+        if (! $this->hasRelationAutoloadCallback()) {
+            return false;
+        }
+
+        $this->triggerRelationAutoloadCallback($key, []);
+
+        return $this->relationLoaded($key);
+    }
+
+    /**
+     * Trigger relation autoload callback.
+     *
+     * @param  string  $key
+     * @param  array  $keys
+     * @return void
+     */
+    protected function triggerRelationAutoloadCallback($key, $keys)
+    {
+        call_user_func(
+            $this->relationAutoloadCallback,
+            array_merge([[$key, get_class($this)]], $keys)
+        );
+    }
+
+    /**
+     * Apply relation autoload callback to value.
+     *
+     * @param  string  $key
+     * @param  mixed  $values
+     * @return void
+     */
+    protected function applyRelationAutoloadCallbackToValue($key, $values)
+    {
+        if (! $this->hasRelationAutoloadCallback() || ! $values) {
+            return;
+        }
+
+        if ($values instanceof Model) {
+            $values = [$values];
+        }
+
+        if (! is_iterable($values)) {
+            return;
+        }
+
+        $callback = fn (array $keys) => $this->triggerRelationAutoloadCallback($key, $keys);
+
+        foreach ($values as $item) {
+            $context = $item->getRelationAutoloadContext();
+
+            // check if relation autoload contexts are different
+            // to avoid circular relation autoload
+            if (is_null($context) || $context !== $this->relationAutoloadContext) {
+                $item->usingRelationAutoloadCallback($this->relationAutoloadContext, $callback);
+            }
+        }
+    }
+
     /**
      * Define a one-to-one relationship.
      *
@@ -917,6 +1057,8 @@ public function setRelation($relation, $value)
     {
         $this->relations[$relation] = $value;
 
+        $this->applyRelationAutoloadCallbackToValue($relation, $value);
+
         return $this;
     }
 
diff --git a/src/Illuminate/Database/Eloquent/Model.php b/src/Illuminate/Database/Eloquent/Model.php
index 7afa59933416..312dc755ef1a 100644
--- a/src/Illuminate/Database/Eloquent/Model.php
+++ b/src/Illuminate/Database/Eloquent/Model.php
@@ -173,6 +173,13 @@ abstract class Model implements Arrayable, ArrayAccess, CanBeEscapedWhenCastToSt
      */
     protected static $modelsShouldPreventLazyLoading = false;
 
+    /**
+     * Indicates whether relations should be automatically loaded on all models.
+     *
+     * @var bool
+     */
+    protected static $modelsShouldGlobalAutoloadRelations = false;
+
     /**
      * The callback that is responsible for handling lazy loading violations.
      *
@@ -442,6 +449,17 @@ public static function preventLazyLoading($value = true)
         static::$modelsShouldPreventLazyLoading = $value;
     }
 
+    /**
+     * Determine if model relationships should be automatically loaded.
+     *
+     * @param  bool  $value
+     * @return void
+     */
+    public static function globalAutoloadRelations($value = true)
+    {
+        static::$modelsShouldGlobalAutoloadRelations = $value;
+    }
+
     /**
      * Register a callback that is responsible for handling lazy loading violations.
      *
@@ -2208,6 +2226,16 @@ public static function preventsLazyLoading()
         return static::$modelsShouldPreventLazyLoading;
     }
 
+    /**
+     * Determine if relations autoload is enabled.
+     *
+     * @return bool
+     */
+    public static function isAutoloadingRelationsGlobally()
+    {
+        return static::$modelsShouldGlobalAutoloadRelations;
+    }
+
     /**
      * Determine if discarding guarded attribute fills is disabled.
      *
diff --git a/tests/Database/DatabaseEloquentBelongsToManyWithCastedAttributesTest.php b/tests/Database/DatabaseEloquentBelongsToManyWithCastedAttributesTest.php
index c7cab6453dfb..08f1bd45a56e 100644
--- a/tests/Database/DatabaseEloquentBelongsToManyWithCastedAttributesTest.php
+++ b/tests/Database/DatabaseEloquentBelongsToManyWithCastedAttributesTest.php
@@ -27,6 +27,7 @@ public function testModelsAreProperlyMatchedToParents()
         $model1->shouldReceive('getAttribute')->with('foo')->passthru();
         $model1->shouldReceive('hasGetMutator')->andReturn(false);
         $model1->shouldReceive('hasAttributeMutator')->andReturn(false);
+        $model1->shouldReceive('hasRelationAutoloadCallback')->andReturn(false);
         $model1->shouldReceive('getCasts')->andReturn([]);
         $model1->shouldReceive('getRelationValue', 'relationLoaded', 'relationResolver', 'setRelation', 'isRelation')->passthru();
 
@@ -36,6 +37,7 @@ public function testModelsAreProperlyMatchedToParents()
         $model2->shouldReceive('getAttribute')->with('foo')->passthru();
         $model2->shouldReceive('hasGetMutator')->andReturn(false);
         $model2->shouldReceive('hasAttributeMutator')->andReturn(false);
+        $model2->shouldReceive('hasRelationAutoloadCallback')->andReturn(false);
         $model2->shouldReceive('getCasts')->andReturn([]);
         $model2->shouldReceive('getRelationValue', 'relationLoaded', 'relationResolver', 'setRelation', 'isRelation')->passthru();
 
diff --git a/tests/Integration/Database/EloquentModelRelationAutoloadTest.php b/tests/Integration/Database/EloquentModelRelationAutoloadTest.php
new file mode 100644
index 000000000000..7891eb30201d
--- /dev/null
+++ b/tests/Integration/Database/EloquentModelRelationAutoloadTest.php
@@ -0,0 +1,183 @@
+<?php
+
+namespace Illuminate\Tests\Integration\Database\EloquentModelRelationAutoloadTest;
+
+use DB;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+use Illuminate\Tests\Integration\Database\DatabaseTestCase;
+
+class EloquentModelRelationAutoloadTest extends DatabaseTestCase
+{
+    protected function afterRefreshingDatabase()
+    {
+        Schema::create('posts', function (Blueprint $table) {
+            $table->increments('id');
+        });
+
+        Schema::create('videos', function (Blueprint $table) {
+            $table->increments('id');
+        });
+
+        Schema::create('comments', function (Blueprint $table) {
+            $table->increments('id');
+            $table->unsignedInteger('parent_id')->nullable();
+            $table->morphs('commentable');
+        });
+
+        Schema::create('likes', function (Blueprint $table) {
+            $table->increments('id');
+            $table->morphs('likeable');
+        });
+    }
+
+    public function testRelationAutoload()
+    {
+        $post1 = Post::create();
+        $comment1 = $post1->comments()->create(['parent_id' => null]);
+        $comment2 = $post1->comments()->create(['parent_id' => $comment1->id]);
+        $comment2->likes()->create();
+        $comment2->likes()->create();
+
+        $post2 = Post::create();
+        $comment3 = $post2->comments()->create(['parent_id' => null]);
+        $comment3->likes()->create();
+
+        $posts = Post::get();
+
+        DB::enableQueryLog();
+
+        $likes = [];
+
+        $posts->withRelationAutoload();
+
+        foreach ($posts as $post) {
+            foreach ($post->comments as $comment) {
+                $likes = array_merge($likes, $comment->likes->all());
+            }
+        }
+
+        $this->assertCount(2, DB::getQueryLog());
+        $this->assertCount(3, $likes);
+        $this->assertTrue($posts[0]->comments[0]->relationLoaded('likes'));
+    }
+
+    public function testRelationAutoloadVariousNestedMorphRelations()
+    {
+        tap(Post::create(), function ($post) {
+            $post->likes()->create();
+            $post->comments()->create();
+            tap($post->comments()->create(), function ($comment) {
+                $comment->likes()->create();
+                $comment->likes()->create();
+            });
+        });
+
+        tap(Post::create(), function ($post) {
+            $post->likes()->create();
+            tap($post->comments()->create(), function ($comment) {
+                $comment->likes()->create();
+            });
+        });
+
+        tap(Video::create(), function ($video) {
+            tap($video->comments()->create(), function ($comment) {
+                $comment->likes()->create();
+            });
+        });
+
+        tap(Video::create(), function ($video) {
+            tap($video->comments()->create(), function ($comment) {
+                $comment->likes()->create();
+            });
+        });
+
+        $likes = Like::get();
+
+        DB::enableQueryLog();
+
+        $videos = [];
+        $videoLike = null;
+
+        $likes->withRelationAutoload();
+
+        foreach ($likes as $like) {
+            $likeable = $like->likeable;
+
+            if (($likeable instanceof Comment) && ($likeable->commentable instanceof Video)) {
+                $videos[] = $likeable->commentable;
+                $videoLike = $like;
+            }
+        }
+
+        $this->assertCount(4, DB::getQueryLog());
+        $this->assertCount(2, $videos);
+        $this->assertTrue($videoLike->relationLoaded('likeable'));
+        $this->assertTrue($videoLike->likeable->relationLoaded('commentable'));
+    }
+}
+
+class Comment extends Model
+{
+    public $timestamps = false;
+
+    protected $guarded = [];
+
+    public function parent()
+    {
+        return $this->belongsTo(self::class);
+    }
+
+    public function likes()
+    {
+        return $this->morphMany(Like::class, 'likeable');
+    }
+
+    public function commentable()
+    {
+        return $this->morphTo();
+    }
+}
+
+class Post extends Model
+{
+    public $timestamps = false;
+
+    public function comments()
+    {
+        return $this->morphMany(Comment::class, 'commentable');
+    }
+
+    public function likes()
+    {
+        return $this->morphMany(Like::class, 'likeable');
+    }
+}
+
+class Video extends Model
+{
+    public $timestamps = false;
+
+    public function comments()
+    {
+        return $this->morphMany(Comment::class, 'commentable');
+    }
+
+    public function likes()
+    {
+        return $this->morphMany(Like::class, 'likeable');
+    }
+}
+
+class Like extends Model
+{
+    public $timestamps = false;
+
+    protected $guarded = [];
+
+    public function likeable()
+    {
+        return $this->morphTo();
+    }
+}