diff --git a/src/Illuminate/Config/Repository.php b/src/Illuminate/Config/Repository.php
index 08801213a0f3..60eba2a5c574 100644
--- a/src/Illuminate/Config/Repository.php
+++ b/src/Illuminate/Config/Repository.php
@@ -8,6 +8,7 @@
 use Illuminate\Support\Collection;
 use Illuminate\Support\Traits\Macroable;
 use InvalidArgumentException;
+use RuntimeException;
 
 class Repository implements ArrayAccess, ConfigContract
 {
@@ -57,6 +58,19 @@ public function get($key, $default = null)
         return Arr::get($this->items, $key, $default);
     }
 
+    /**
+     * Get the specified configuration value.
+     *
+     * @param  string  $key
+     * @return mixed
+     *
+     * @throws \RuntimeException
+     */
+    public function getOrFail(string $key)
+    {
+        return $this->get($key) ?? throw new RuntimeException("Configuration value for key [$key] is not set.");
+    }
+
     /**
      * Get many configuration values.
      *
diff --git a/src/Illuminate/Foundation/helpers.php b/src/Illuminate/Foundation/helpers.php
index 2580b987cb6c..006694720035 100644
--- a/src/Illuminate/Foundation/helpers.php
+++ b/src/Illuminate/Foundation/helpers.php
@@ -316,6 +316,19 @@ function config($key = null, $default = null)
     }
 }
 
+if (! function_exists('config_or_fail')) {
+    /**
+     * Get the specified configuration value.
+     *
+     * @param  string  $key
+     * @return mixed
+     */
+    function config_or_fail(string $key)
+    {
+        return app('config')->getOrFail($key);
+    }
+}
+
 if (! function_exists('config_path')) {
     /**
      * Get the configuration path.
diff --git a/tests/Config/RepositoryTest.php b/tests/Config/RepositoryTest.php
index cf59e78b0c49..32d1db7c80ce 100644
--- a/tests/Config/RepositoryTest.php
+++ b/tests/Config/RepositoryTest.php
@@ -6,6 +6,7 @@
 use Illuminate\Support\Collection;
 use InvalidArgumentException;
 use PHPUnit\Framework\TestCase;
+use RuntimeException;
 
 class RepositoryTest extends TestCase
 {
@@ -151,6 +152,19 @@ public function testGetWithDefault()
         $this->assertSame('default', $this->repository->get('not-exist', 'default'));
     }
 
+    public function testGetOrFailGets()
+    {
+        $this->assertSame('bar', $this->repository->getOrFail('foo'));
+    }
+
+    public function testGetOrFailFails()
+    {
+        $this->expectException(RuntimeException::class);
+        $this->expectExceptionMessageMatches('#^Configuration value for key \[not-exist\] is not set.#');
+
+        $this->repository->getOrFail('not-exist');
+    }
+
     public function testSet()
     {
         $this->repository->set('key', 'value');