What it usually means
Strangers are among the most common figures in dreams. Most dreams are populated by people the dreamer cannot name: a man at a door, a woman on a train, a crowd of faces, a child who seems to belong to no one. Their frequency alone suggests they are doing important work.
Often that work is newness. A stranger brings what has not yet been part of your life: a change, an opportunity, a threat, an idea. Dreams of meeting strangers tend to come in periods when life is opening onto unfamiliar ground — a new city, a new job, a new relationship.
Just as often the stranger is a part of you that you do not yet recognise as yours. A stranger can behave with a confidence you lack, a cruelty you deny, a tenderness you keep hidden. Because they are unknown, they can carry what you would not attribute to anyone familiar — least of all yourself.
How the stranger made you feel is the key, more than how they looked. Fear, attraction, curiosity, trust: the emotion is usually more informative than anything the stranger said or did.
Worth saying plainly: the popular claim that every face in a dream belongs to someone you once saw in waking life is not established. The dreaming mind builds faces freely, and a stranger does not have to be a forgotten passer-by.
What changes the meaning
A threatening stranger. A fear without a clear source; often a quality of your own you have not faced.
A kind or helpful stranger. Unexpected support; inner resources you have not yet used.
A stranger who knows you. A part of you that understands more than you do consciously.
A stranger in your home. Something new or unacknowledged entering your private life.
Following a stranger. Curiosity, attraction to the unknown, a direction you have not chosen yet.
Being followed by a stranger. Something unresolved pursuing you.
A stranger of the opposite sex. Attraction, or qualities you do not identify with but need.
A stranger of your own sex. Often a shadow figure — traits close to you that you have not accepted.
Falling in love with a stranger. Longing for something your life lacks, more than for a person.
A stranger with a familiar face. A person you know showing an unfamiliar side.
A stranger giving you something. A new idea, gift or responsibility arriving from an unexpected direction.
A crowd of strangers. Anonymity, social pressure, or feeling lost among others.
When it keeps coming back
Recurring stranger dreams often feature the same unknown person night after night. Such figures usually stand for something persistent in the psyche: a talent, a fear, a longing that keeps asking to be recognised.
They are also common after moves and migrations, when daily life is literally full of strangers and the mind is still learning the new faces.
If one stranger keeps returning, try describing them in detail on waking — age, clothes, manner, mood. Over time the description often starts to sound like someone you know quite well.
In Jungian terms
Jung found that the complexes — emotionally charged clusters of memory and feeling — behave like small independent personalities. He called them splinter psyches, and noted that in dreams they tend to appear personified, as people with their own voices and intentions. Many dream strangers, in his reading, are exactly that: parts of the dreamer that have taken on a face.
He also distinguished two typical forms. An unknown figure of the dreamer's own sex often carries the shadow; one of the opposite sex often carries what he called the anima or animus, the inner image of the other that links the ego to deeper layers of the psyche.
Read this way, every dream stranger is an introduction. Who in you was trying to meet you?