God

God created the heavens and the earth. He has yet to make an appearence in this show.

Known servants
Castiel

Anna Milton (A fallen angel)

Uriel (Uriel betrayed God when he started murdering the angels)

Zachariah (Zachariah was Castiel's superior. He too betrayed God)

Lucifer (At one point Lucifer was an angel, but he disobeyed God and was sent to Hell)