The Italian Parametric Earthquake Catalogue (CPTI, Catalogo Parametrico dei Terremoti Italiani) represents the most extensive and reliable source of parameters for earthquakes in Italy and surrounding areas. CPTI15 is the fourth release of the CPTI series, the first dating back to 1999, and provides the most advanced and updated sets of macroseismic and instrumental data and parameters, for Italian earthquakes with maximum intensity I ≥ 5 or magnitude Mw ≥ 4.0 in the period 1000-2014. The catalogue lists 4584 events, 70% of which are based on the macroseismic datapoints provided by the Italian Macroseismic Database DBMI15. If available, both macroseismic and instrumental parameters are provided, together with a set of “preferred ones”, which consist of a selection between the macroseismic and the instrumental epicentres, and the weighted average of the macroseismic and instrumental magnitudes.