What does it mean to dream about lion?
A lion usually points to power, pride, and authority, your own or someone else's, and whether you command it or fear it tends to be the question.
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 treat the lion as an image of a commanding figure or of the dreamer's own assertive, sometimes aggressive drives. Being chased by it or ruling over it shows how those forces sit.
After Freud, The Interpretation of Dreams (Brill trans., 1913), public domain.Jung
For Jung the lion can image the noble, sovereign self and the mastery of instinct, the sun-animal of conscious strength. Tamed or raging, it mirrors how the will is being handled.
Jungian concept (our summary).Modern
Continuity readings link the lion to waking concerns about leadership, courage, or confrontation. The threat-simulation idea fits when the lion attacks.
Continuity hypothesis (our summary).Mythological
The lion is the king across cultures, from the Egyptian Sekhmet and the riddling sphinx to the Nemean lion of Heracles and the lion of Judah. It is the steady emblem of royal and divine power.
Rosmerta Publishing editorial synthesis (after Bulfinch; Frazer).