What does it mean to dream about skull?
A skull tends to bring mortality to the foreground, an ending, a memento of death, or a confrontation with what outlasts the living.
Four ways to read it
Each reading below comes from a named tradition and a cited source, so you can see where it came from and decide what fits your dream.
Freud
Freud would read a stark reminder of death and the body's limit, and the fear or fascination it stirs.
After Freud, The Interpretation of Dreams (Brill trans., 1913), public domain.Jung
Jung would see the face of mortality the self must integrate, and sometimes wisdom won by facing the end.
Jungian concept (our summary).Modern
Continuity ties skulls to waking thoughts of death, danger, or the passing of time, and to the mind's rehearsal of loss.
Continuity hypothesis (our summary).Mythological
The skull is the memento mori of every tradition, from the Mexican Day of the Dead to the philosopher's reminder that all flesh ends.
Rosmerta Publishing editorial synthesis (after Frazer; Brewer).