A judge will often appear in your dreams when you are trying to make a decision, balance two different ways of thinking or behaving, or settle a dispute between people that you know. This is to warn you to look at things from logical as well as emotional and intuitive perspectives, and to temper justice with compassion.
Because justice has to do with behaving according to the rules of society, you may dream about a judge when you are thinking about how you fit in with the people around you and to what degree you wish to conform.
A judge, or magistrate, is an authority figure, so the actions of a judge in a dream will have something to do with the way you feel about authority.
Dreaming that you are in front of a judge can mean that you believe that others are judging you, perhaps unfairly, in waking life. You could be feeling guilty about something, and in your dream, you could be the judge and judging yourself.