Leaf (10) for an artificial tree (12), advantageously a leaf similar to that of a coconut palm, comprising a central supporting element (15) able to be associated with a branch (11) of the artificial tree (12), and a plurality of lateral elements (16) connected on opposite sides to the central element (15). The central element (15) has a transverse section including a segment (17) shaped substantially as a V, a U, a C or other analogous or similar shapes. The lateral elements (16) have a thickness (S'') variable along its length from a maximum value (S'') close to the central element (15) to a minimum value (S''') close the relative tip.