How to access Custom Inspector own gameObject

If you have written a custom inspector for the script MyScript, the target variable is of the type MyScript. As long as MyScript is a monobehaviour, you can grab it's gameObject as normal, you just need the cast to MyScript first. I like to grab the script in OnEnable, and make it available as a field:

 [CustomEditor(typeof(MyScript))]
 public class MyScriptEditor : Editor {
 
     MyScript script;
     GameObject scriptObject;
 
     void OnEnable() {
         script = (MyScript) target;
         scriptObject = script.gameObject;
     }
 
     void OnInspectorGUI() {
         ...
     }
 }