diff --git a/packages/monorepo-builder/README.md b/packages/monorepo-builder/README.md
index d70598a4706..09e0add2226 100644
--- a/packages/monorepo-builder/README.md
+++ b/packages/monorepo-builder/README.md
@@ -58,6 +58,15 @@ parameters:
 
 Sections are sorted for you by saint defaults. Do you want change the order? Just override `section_order` parameter.
 
+To exclude a specific folder for ignoring the composer.json in this folder.
+
+```yaml
+# monorepo-builder.yml
+parameters:
+    package_directories_excludes:
+        - 'ExcludeThis'
+```
+
 #### After Merge Options
 
 Do you need to add or remove some packages only to root `composer.json`?
diff --git a/packages/monorepo-builder/config/config.yaml b/packages/monorepo-builder/config/config.yaml
index e22df7a1550..c07382dbbe3 100644
--- a/packages/monorepo-builder/config/config.yaml
+++ b/packages/monorepo-builder/config/config.yaml
@@ -5,6 +5,7 @@ imports:
 parameters:
     package_directories:
         - 'packages'
+    package_directories_excludes: []
     data_to_append: []
     data_to_remove: []
     package_alias_format: '<major>.<minor>-dev'
diff --git a/packages/monorepo-builder/src/Finder/PackageComposerFinder.php b/packages/monorepo-builder/src/Finder/PackageComposerFinder.php
index eece63681dc..6f3d5f1abf3 100644
--- a/packages/monorepo-builder/src/Finder/PackageComposerFinder.php
+++ b/packages/monorepo-builder/src/Finder/PackageComposerFinder.php
@@ -15,6 +15,11 @@ final class PackageComposerFinder
      */
     private $packageDirectories = [];
 
+    /**
+     * @var string[]
+     */
+    private $packageDirectoriesExcludes = [];
+
     /**
      * @var FinderSanitizer
      */
@@ -22,10 +27,15 @@ final class PackageComposerFinder
 
     /**
      * @param string[] $packageDirectories
+     * @param string[] $packageDirectoriesExcludes
      */
-    public function __construct(array $packageDirectories, FinderSanitizer $finderSanitizer)
-    {
+    public function __construct(
+        array $packageDirectories,
+        array $packageDirectoriesExcludes,
+        FinderSanitizer $finderSanitizer
+    ) {
         $this->packageDirectories = $packageDirectories;
+        $this->packageDirectoriesExcludes = $packageDirectoriesExcludes;
         $this->finderSanitizer = $finderSanitizer;
     }
 
@@ -47,6 +57,10 @@ public function getPackageComposerFiles(): array
             ->exclude('node_modules')
             ->name('composer.json');
 
+        foreach ($this->packageDirectoriesExcludes as $excludeFolder) {
+            $finder->exclude($excludeFolder);
+        }
+
         if (! $this->isPHPUnit()) {
             $finder->notPath('#tests#');
         }
diff --git a/packages/monorepo-builder/tests/Finder/PackageComposerFinder/Source/First/ExcludeThis/composer.json b/packages/monorepo-builder/tests/Finder/PackageComposerFinder/Source/First/ExcludeThis/composer.json
new file mode 100644
index 00000000000..1934c075f5b
--- /dev/null
+++ b/packages/monorepo-builder/tests/Finder/PackageComposerFinder/Source/First/ExcludeThis/composer.json
@@ -0,0 +1,3 @@
+{
+    "name": "first/excludePackage"
+}
diff --git a/packages/monorepo-builder/tests/Finder/PackageComposerFinder/Source/source_config.yaml b/packages/monorepo-builder/tests/Finder/PackageComposerFinder/Source/source_config.yaml
index ee1c69447d3..c52b242e62a 100644
--- a/packages/monorepo-builder/tests/Finder/PackageComposerFinder/Source/source_config.yaml
+++ b/packages/monorepo-builder/tests/Finder/PackageComposerFinder/Source/source_config.yaml
@@ -1,3 +1,5 @@
 parameters:
     package_directories:
         - '%kernel.project_dir%/tests/Finder/PackageComposerFinder/Source'
+    package_directories_excludes:
+        - 'ExcludeThis'