diff --git a/src/Symfony/Component/OptionsResolver/CHANGELOG.md b/src/Symfony/Component/OptionsResolver/CHANGELOG.md
index d996e309f3..84c45946a9 100644
--- a/src/Symfony/Component/OptionsResolver/CHANGELOG.md
+++ b/src/Symfony/Component/OptionsResolver/CHANGELOG.md
@@ -1,6 +1,11 @@
 CHANGELOG
 =========
 
+5.3
+---
+
+ * Add prototype definition for nested options
+
 5.1.0
 -----
 
diff --git a/src/Symfony/Component/OptionsResolver/OptionsResolver.php b/src/Symfony/Component/OptionsResolver/OptionsResolver.php
index e369615e59..a8ae153f46 100644
--- a/src/Symfony/Component/OptionsResolver/OptionsResolver.php
+++ b/src/Symfony/Component/OptionsResolver/OptionsResolver.php
@@ -130,6 +130,16 @@ class OptionsResolver implements Options
 
     private $parentsOptions = [];
 
+    /**
+     * Whether the whole options definition is marked as array prototype.
+     */
+    private $prototype;
+
+    /**
+     * The prototype array's index that is being read.
+     */
+    private $prototypeIndex;
+
     /**
      * Sets the default value of a given option.
      *
@@ -789,6 +799,33 @@ class OptionsResolver implements Options
         return $this->info[$option] ?? null;
     }
 
+    /**
+     * Marks the whole options definition as array prototype.
+     *
+     * @return $this
+     *
+     * @throws AccessException If called from a lazy option, a normalizer or a root definition
+     */
+    public function setPrototype(bool $prototype): self
+    {
+        if ($this->locked) {
+            throw new AccessException('The prototype property cannot be set from a lazy option or normalizer.');
+        }
+
+        if (null === $this->prototype && $prototype) {
+            throw new AccessException('The prototype property cannot be set from a root definition.');
+        }
+
+        $this->prototype = $prototype;
+
+        return $this;
+    }
+
+    public function isPrototype(): bool
+    {
+        return $this->prototype ?? false;
+    }
+
     /**
      * Removes the option with the given name.
      *
@@ -970,13 +1007,29 @@ class OptionsResolver implements Options
             $this->calling[$option] = true;
             try {
                 $resolver = new self();
+                $resolver->prototype = false;
                 $resolver->parentsOptions = $this->parentsOptions;
                 $resolver->parentsOptions[] = $option;
                 foreach ($this->nested[$option] as $closure) {
                     $closure($resolver, $this);
                 }
-                $value = $resolver->resolve($value);
+
+                if ($resolver->prototype) {
+                    $values = [];
+                    foreach ($value as $index => $prototypeValue) {
+                        if (!\is_array($prototypeValue)) {
+                            throw new InvalidOptionsException(sprintf('The value of the option "%s" is expected to be of type array of array, but is of type array of "%s".', $this->formatOptions([$option]), get_debug_type($prototypeValue)));
+                        }
+
+                        $resolver->prototypeIndex = $index;
+                        $values[$index] = $resolver->resolve($prototypeValue);
+                    }
+                    $value = $values;
+                } else {
+                    $value = $resolver->resolve($value);
+                }
             } finally {
+                $resolver->prototypeIndex = null;
                 unset($this->calling[$option]);
             }
         }
@@ -1286,6 +1339,10 @@ class OptionsResolver implements Options
                 $prefix .= sprintf('[%s]', implode('][', $this->parentsOptions));
             }
 
+            if ($this->prototype && null !== $this->prototypeIndex) {
+                $prefix .= sprintf('[%s]', $this->prototypeIndex);
+            }
+
             $options = array_map(static function (string $option) use ($prefix): string {
                 return sprintf('%s[%s]', $prefix, $option);
             }, $options);
diff --git a/src/Symfony/Component/OptionsResolver/Tests/OptionsResolverTest.php b/src/Symfony/Component/OptionsResolver/Tests/OptionsResolverTest.php
index 205f3fa1e8..3c36225e18 100644
--- a/src/Symfony/Component/OptionsResolver/Tests/OptionsResolverTest.php
+++ b/src/Symfony/Component/OptionsResolver/Tests/OptionsResolverTest.php
@@ -2504,4 +2504,91 @@ class OptionsResolverTest extends TestCase
             ->setDeprecated('foo')
         ;
     }
+
+    public function testInvalidValueForPrototypeDefinition()
+    {
+        $this->expectException(InvalidOptionsException::class);
+        $this->expectExceptionMessage('The value of the option "connections" is expected to be of type array of array, but is of type array of "string".');
+
+        $this->resolver
+            ->setDefault('connections', static function (OptionsResolver $resolver) {
+                $resolver
+                    ->setPrototype(true)
+                    ->setDefined(['table', 'user', 'password'])
+                ;
+            })
+        ;
+
+        $this->resolver->resolve(['connections' => ['foo']]);
+    }
+
+    public function testMissingOptionForPrototypeDefinition()
+    {
+        $this->expectException(MissingOptionsException::class);
+        $this->expectExceptionMessage('The required option "connections[1][table]" is missing.');
+
+        $this->resolver
+            ->setDefault('connections', static function (OptionsResolver $resolver) {
+                $resolver
+                    ->setPrototype(true)
+                    ->setRequired('table')
+                ;
+            })
+        ;
+
+        $this->resolver->resolve(['connections' => [
+            ['table' => 'default'],
+            [], // <- missing required option "table"
+        ]]);
+    }
+
+    public function testAccessExceptionOnPrototypeDefinition()
+    {
+        $this->expectException(AccessException::class);
+        $this->expectExceptionMessage('The prototype property cannot be set from a root definition.');
+
+        $this->resolver->setPrototype(true);
+    }
+
+    public function testPrototypeDefinition()
+    {
+        $this->resolver
+            ->setDefault('connections', static function (OptionsResolver $resolver) {
+                $resolver
+                    ->setPrototype(true)
+                    ->setRequired('table')
+                    ->setDefaults(['user' => 'root', 'password' => null])
+                ;
+            })
+        ;
+
+        $actualOptions = $this->resolver->resolve([
+            'connections' => [
+                'default' => [
+                    'table' => 'default',
+                ],
+                'custom' => [
+                    'user' => 'foo',
+                    'password' => 'pa$$',
+                    'table' => 'symfony',
+                ],
+            ],
+        ]);
+        $expectedOptions = [
+            'connections' => [
+                'default' => [
+                    'user' => 'root',
+                    'password' => null,
+                    'table' => 'default',
+                ],
+                'custom' => [
+                    'user' => 'foo',
+                    'password' => 'pa$$',
+                    'table' => 'symfony',
+                ],
+            ],
+        ];
+
+        $this->assertSame($expectedOptions, $actualOptions);
+    }
 }