The damson or damson plum (Prunus domestica subsp. insititia, or sometimes Prunus insititia), also archaically called the "damascene" is an edible drupaceous fruit, a subspecies of the plum tree. Varieties of insititia are found across Europe, but the name "damson" is derived from and most commonly applied to forms which are native to Ireland and Great Britain. Damsons are relatively small plum-like fruit with a distinctive, somewhat astringent taste, and are widely used for culinary purposes, particularly in fruit preserves or jam.
In South and Southeast Asia, the term "damson plum" sometimes refers to Jambul, the fruit from a tree in the Myrtaceae family. The name "mountain damson" or "bitter damson" was also formerly applied in Jamaica to the tree Simarouba amara.