diff --git a/java/com/google/gerrit/plugins/codeowners/api/BranchCodeOwners.java b/java/com/google/gerrit/plugins/codeowners/api/BranchCodeOwners.java
index 1836ca9..2b81afb 100644
--- a/java/com/google/gerrit/plugins/codeowners/api/BranchCodeOwners.java
+++ b/java/com/google/gerrit/plugins/codeowners/api/BranchCodeOwners.java
@@ -32,8 +32,20 @@
   CodeOwnerConfigFilesRequest codeOwnerConfigFiles() throws RestApiException;
 
   abstract class CodeOwnerConfigFilesRequest {
+    private boolean includeNonParsableFiles;
     private String email;
 
+    /** Includes non-parsable code owner config files into the result. */
+    public CodeOwnerConfigFilesRequest includeNonParsableFiles(boolean includeNonParsableFiles) {
+      this.includeNonParsableFiles = includeNonParsableFiles;
+      return this;
+    }
+
+    /** Whether non-parsable code owner config files should be included into the result. */
+    public boolean getIncludeNonParsableFiles() {
+      return includeNonParsableFiles;
+    }
+
     /**
      * Limits the returned code owner config files to those that contain the given email.
      *
diff --git a/java/com/google/gerrit/plugins/codeowners/api/BranchCodeOwnersImpl.java b/java/com/google/gerrit/plugins/codeowners/api/BranchCodeOwnersImpl.java
index 6ed89a9..aacc3e2 100644
--- a/java/com/google/gerrit/plugins/codeowners/api/BranchCodeOwnersImpl.java
+++ b/java/com/google/gerrit/plugins/codeowners/api/BranchCodeOwnersImpl.java
@@ -60,6 +60,7 @@
       @Override
       public List<String> paths() throws RestApiException {
         GetCodeOwnerConfigFiles getCodeOwnerConfigFiles = getCodeOwnerConfigFilesProvider.get();
+        getCodeOwnerConfigFiles.setIncludeNonParsableFiles(getIncludeNonParsableFiles());
         getCodeOwnerConfigFiles.setEmail(getEmail());
         return getCodeOwnerConfigFiles.apply(branchResource).value();
       }
diff --git a/java/com/google/gerrit/plugins/codeowners/restapi/GetCodeOwnerConfigFiles.java b/java/com/google/gerrit/plugins/codeowners/restapi/GetCodeOwnerConfigFiles.java
index 0ebf942..8190e7c 100644
--- a/java/com/google/gerrit/plugins/codeowners/restapi/GetCodeOwnerConfigFiles.java
+++ b/java/com/google/gerrit/plugins/codeowners/restapi/GetCodeOwnerConfigFiles.java
@@ -20,6 +20,7 @@
 import com.google.common.collect.ImmutableList;
 import com.google.common.flogger.FluentLogger;
 import com.google.gerrit.common.Nullable;
+import com.google.gerrit.extensions.restapi.BadRequestException;
 import com.google.gerrit.extensions.restapi.Response;
 import com.google.gerrit.extensions.restapi.RestReadView;
 import com.google.gerrit.plugins.codeowners.backend.CodeOwnerBackend;
@@ -48,9 +49,17 @@
   private final CodeOwnersPluginConfiguration codeOwnersPluginConfiguration;
   private final CodeOwnerConfigScanner.Factory codeOwnerConfigScannerFactory;
 
+  private boolean includeNonParsableFiles;
   private String email;
 
   @Option(
+      name = "--include-non-parsable-files",
+      usage = "includes non-parseable code owner config files in the response")
+  public void setIncludeNonParsableFiles(boolean includeNonParsableFiles) {
+    this.includeNonParsableFiles = includeNonParsableFiles;
+  }
+
+  @Option(
       name = "--email",
       metaVar = "EMAIL",
       usage = "limits the returned code owner config files to those that contain this email")
@@ -67,7 +76,9 @@
   }
 
   @Override
-  public Response<List<String>> apply(BranchResource resource) {
+  public Response<List<String>> apply(BranchResource resource) throws BadRequestException {
+    validateOptions();
+
     CodeOwnerBackend codeOwnerBackend =
         codeOwnersPluginConfiguration.getBackend(resource.getBranchKey());
     ImmutableList.Builder<Path> codeOwnerConfigs = ImmutableList.builder();
@@ -93,7 +104,11 @@
               }
               return true;
             },
-            CodeOwnerConfigScanner.ignoreInvalidCodeOwnerConfigFiles());
+            includeNonParsableFiles
+                ? (codeOwnerConfigFilePath, configInvalidException) -> {
+                  codeOwnerConfigs.add(codeOwnerConfigFilePath);
+                }
+                : CodeOwnerConfigScanner.ignoreInvalidCodeOwnerConfigFiles());
     return Response.ok(
         codeOwnerConfigs.build().stream().map(Path::toString).collect(toImmutableList()));
   }
@@ -120,4 +135,11 @@
     }
     return containsEmail;
   }
+
+  private void validateOptions() throws BadRequestException {
+    if (email != null && includeNonParsableFiles) {
+      throw new BadRequestException(
+          "the options 'email' and 'include-non-parsable-files' are mutually exclusive");
+    }
+  }
 }
diff --git a/javatests/com/google/gerrit/plugins/codeowners/acceptance/api/GetCodeOwnerConfigFilesIT.java b/javatests/com/google/gerrit/plugins/codeowners/acceptance/api/GetCodeOwnerConfigFilesIT.java
index 50b795b..284f01b 100644
--- a/javatests/com/google/gerrit/plugins/codeowners/acceptance/api/GetCodeOwnerConfigFilesIT.java
+++ b/javatests/com/google/gerrit/plugins/codeowners/acceptance/api/GetCodeOwnerConfigFilesIT.java
@@ -15,9 +15,11 @@
 package com.google.gerrit.plugins.codeowners.acceptance.api;
 
 import static com.google.common.truth.Truth.assertThat;
+import static com.google.gerrit.testing.GerritJUnit.assertThrows;
 
 import com.google.gerrit.acceptance.TestAccount;
 import com.google.gerrit.entities.RefNames;
+import com.google.gerrit.extensions.restapi.BadRequestException;
 import com.google.gerrit.plugins.codeowners.JgitPath;
 import com.google.gerrit.plugins.codeowners.acceptance.AbstractCodeOwnersIT;
 import com.google.gerrit.plugins.codeowners.backend.CodeOwnerBackend;
@@ -226,6 +228,50 @@
   }
 
   @Test
+  public void includeInvalidCodeOwnerConfigFiles() throws Exception {
+    String nameOfInvalidCodeOwnerConfigFile = getCodeOwnerConfigFileName();
+    createInvalidCodeOwnerConfig(nameOfInvalidCodeOwnerConfigFile);
+
+    CodeOwnerConfig.Key codeOwnerConfigKey =
+        codeOwnerConfigOperations
+            .newCodeOwnerConfig()
+            .project(project)
+            .branch("master")
+            .folderPath("/foo/")
+            .addCodeOwnerEmail(admin.email())
+            .create();
+
+    assertThat(
+            projectCodeOwnersApiFactory
+                .project(project)
+                .branch("master")
+                .codeOwnerConfigFiles()
+                .includeNonParsableFiles(true)
+                .paths())
+        .containsExactly(
+            JgitPath.of(nameOfInvalidCodeOwnerConfigFile).getAsAbsolutePath().toString(),
+            codeOwnerConfigOperations.codeOwnerConfig(codeOwnerConfigKey).getFilePath());
+  }
+
+  @Test
+  public void includeNonParsableFilesAndEmailOptionsAreMutuallyExclusive() throws Exception {
+    BadRequestException exception =
+        assertThrows(
+            BadRequestException.class,
+            () ->
+                projectCodeOwnersApiFactory
+                    .project(project)
+                    .branch("master")
+                    .codeOwnerConfigFiles()
+                    .includeNonParsableFiles(true)
+                    .withEmail(admin.email())
+                    .paths());
+    assertThat(exception)
+        .hasMessageThat()
+        .isEqualTo("the options 'email' and 'include-non-parsable-files' are mutually exclusive");
+  }
+
+  @Test
   public void filterByEmail() throws Exception {
     TestAccount user2 = accountCreator.user2();
     TestAccount user3 = accountCreator.create("user3", "user3@example.com", "User3", null);
diff --git a/resources/Documentation/rest-api.md b/resources/Documentation/rest-api.md
index 7044cd8..c2aafff 100644
--- a/resources/Documentation/rest-api.md
+++ b/resources/Documentation/rest-api.md
@@ -182,8 +182,8 @@
 
 | Field Name  |          | Description |
 | ----------- | -------- | ----------- |
-| `email`     | optional | Code owner email that must appear in the returned
-code owner config files.
+| `include-non-parsable-files` | optional | Includes non-parseable code owner config files in the response. By default `false`. Cannot be used in combination with the `email` option.
+| `email`     | optional | Code owner email that must appear in the returned code owner config files.
 
 #### Request
 
@@ -195,7 +195,8 @@
 result also includes code owner config that use name prefixes
 ('\<prefix\>_OWNERS') or name extensions ('OWNERS_\<extension\>').
 
-Non-parseable code owner config files are omitted from the response.
+Non-parseable code owner config files are omitted from the response, unless the
+`include-non-parsable-files` option was set.
 
 #### Response