Pseudocercospora pistacina is a species of fungus in the family Mycosphaerellaceae. Known from Greece, Iran, Syria, and Turkey, it is a plant pathogen that infects the leaves of pistachio trees (Pistacia vera). It is one of the causative agents of a leaf spot disease commonly known as Pseudocercospora leaf spot (PLS) or Septoria leaf spot (SLS), alongside Septoria pistaciarum and Septoria pistaciae.