diff --git a/NEWS b/NEWS
index 0079fd8487..e7838bd35f 100644
--- a/NEWS
+++ b/NEWS
@@ -8,6 +8,8 @@ Overview of changes since NetworkManager-1.44
   should not be noticeable.
 * Honor udev property ID_NET_AUTO_LINK_LOCAL_ONLY=1 for enabling
   link local addresses on default wired connection.
+* Honor udev property ID_NET_MANAGED_BY to only manage an interface
+  when set to "org.freedesktop.NetworkManager".
 
 =============================================
 NetworkManager-1.44
diff --git a/man/NetworkManager.xml b/man/NetworkManager.xml
index 5c17bd52fc..ff1635cd29 100644
--- a/man/NetworkManager.xml
+++ b/man/NetworkManager.xml
@@ -193,6 +193,15 @@
         </para>
         </listitem>
       </varlistentry>
+      <varlistentry>
+        <term><varname>ID_NET_MANAGED_BY</varname></term>
+        <listitem><para>
+          If <varname>NM_UNMANAGED</varname> is set, this has no effect. Otherwise,
+          if the attribute is set to anything but
+          <literal>"org.freedesktop.NetworkManager"</literal>, the device is unmanaged.
+        </para>
+        </listitem>
+      </varlistentry>
       <varlistentry>
         <term><varname>NM_AUTO_DEFAULT_LINK_LOCAL_ONLY</varname></term>
         <listitem><para>
diff --git a/src/libnm-platform/nm-platform.c b/src/libnm-platform/nm-platform.c
index e55c749931..d5acec98f5 100644
--- a/src/libnm-platform/nm-platform.c
+++ b/src/libnm-platform/nm-platform.c
@@ -1673,6 +1673,15 @@ nm_platform_link_get_unmanaged(NMPlatform *self, int ifindex)
     if (val)
         return _nm_utils_ascii_str_to_bool(val, FALSE);
 
+    val = udev_device_get_property_value(udevice, "ID_NET_MANAGED_BY");
+    if (val) {
+        if (!nm_streq(val, "org.freedesktop.NetworkManager")) {
+            /* There is another manager. UNMANAGED. */
+            return TRUE;
+        }
+        return FALSE;
+    }
+
     return NM_OPTION_BOOL_DEFAULT;
 }