What does it mean to dream about leaf?
A leaf often stands for a single season of growth or change, the small living detail that shows whether a thing is thriving or fading.
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 ask what the leaf brought to mind for you, a particular tree, a season, a memory. Fresh leaves might stand in for a hope the mind dresses in natural images. Falling leaves can quietly carry feelings about loss that the waking self sets aside.
After Freud, The Interpretation of Dreams (Brill trans., 1913), public domain.Jung
Jung might see leaves as the many small expressions of the one living tree of the self, each part of a larger growth. Green leaves can speak of vitality, while their turning and falling marks the natural cycle the psyche moves through. The state of the leaf often mirrors an inner season.
Jungian concept (our summary).Modern
Under continuity, leaves tend to echo waking thoughts about change, seasons, and the passing of time. Budding leaves may track fresh starts, while dead ones can follow endings or tiredness. The detail you noticed is usually the thread worth pulling.
Continuity hypothesis (our summary).Mythological
In many traditions leaves stand for the turning year, green in their prime and shed in their time. Certain leaves, like the laurel or the olive, became signs of honour and peace. The single leaf has long served as a small emblem of life's seasons.
Rosmerta Publishing editorial synthesis (after Bulfinch; Brewer).