This catalogue provides a comprehensive synthesis of the lichenicolous fungi known from Italy, based on historical literature, recent studies, and extensive fieldwork conducted since 2006. After a brief overview of the history of lichenicolous mycology in Italy – from its beginnings in the mid-19th century through periods of stagnation and renewed research ‒ the work presents two annotated lists. The main list includes 518 taxa of genuine, obligately non-lichenised lichenicolous fungi recorded in Italy, while a second list comprises 76 taxa that are facultatively lichenicolous, slightly lichenised, or taxonomically uncertain. For each taxon, host species in Italy, commonly used synonyms, and regional records are provided. The catalogue documents both the remarkable work of the early enthusiasts during the "Golden Age" and the substantial increase in known diversity over the last decades, placing Italy among the best-studied regions worldwide for lichenicolous fungi and accounting for more than one fifth of all obligately lichenicolous, non-lichenised fungi currently known globally.