The interpretation of seeing and interacting with a stranger, or strangers, in your dream depends on the details of your dream and on your personal belief system. Some Eastern cultures believe that the strangers in your dreams are spirits from another dimension. These spirits may be teaching you lessons or giving you specific messages.
The more modern approach to interpreting a dream with strangers in it is that they represent different sides or unfamiliar aspects of our personality.
The best way to tell is to “check inside” of yourself and simply try to understand the message of this dream. Whether the message is coming from your unconscious or from a different reality might be irrelevant.
The lessons gained through a dream are far more important then where they came from. Just remember: The mind that dreamt the dream also knows its source and meaning (and that is YOUR own mind). See also: People... The Bedside Dream Dictionary
To dream of a stranger represents an aspect or quality that you refuse to show to others. It may also be suggesting a solution or resolution for an issue that is causing you anxiety.... Dream Symbols and Analysis
To dream of a stranger symbolizes an aspect of yourself you haven’t met yet. That which is foreign can be judged at first as a threat, bad, or wrong. See Integration Dreams.... Strangest Dream Explanations
The stranger in a dream represents that part of ourselves that we do not yet know. There may be a feeling of awe or of conflict with which we need to deal before we can progress. Also consult shadow in the introduction.... Dream Meanings of Versatile
Dreams in which a stranger brings you an important message represent your unconscious mind telling you what you need to hear. This dream can also represent your feelings about someone you love who has died.
If you dream of being in love with a stranger in your dream, especially if the dream is recurring, your heart is longing for a true love to call your own.... My Dream Interpretation
(see Crowd, Men, Women) Freudian: Unsatisfied or unrecognized libido; repressed emotions.
Situational: Think back to see if you met someone recently who made a stronger impression than initially realized.
A part of yourself with which you have remained unfamiliar.
Does the stranger say anything? This may be an important observation, insight, or question to ponder. Strangers are sometimes easier to talk to because they have no personal involvement in our situations, so your subconscious may personify itself through such images.... The Language of Dreams