The Ischia island (Italy) is largely occupied by a resurgent caldera characterized by one of the highest uplift of its floor ever recognized, that is in the order of 1000 m over at least 55-33 ka. This process produced an asymmetric fault-bounded block, whose northern side experienced several shallow (< 2 km depth) and destructive earthquakes in 1881, 1883 and 2017 (M4.0) (Selva et al., 2019). Presently the area is characterized by differential ground movements, generally dominated by subsidence of the resurgent block. This phenomenon is well constrained by the following levelling measurements.Vertical ground deformations of Ischia have been monitored by means of periodic measurements along a complex and dense leveling network, which was first established by Istituto Geografico Militare in 1913, following the 1881-1883 earthquakes and the intense flood of 1910. The present network, implemented through time, is 110 km long and includes 260 benchmarks. The reference benchmark for all measurements is installed along the northeastern coast, at Porto d'Ischia (Church of S. Maria di Portosalvo, elevation = 3.0360 m; Del Gaudio et al., 2011).The network is mainly arranged in loops because such a configuration permits to minimize and check the errors associated to the leveling measurements.The orthometric height of all benchmarks, computed with respect to the reference site, is obtained by minimizing the misclosures of each loop by means of a least-squares compensation applied to the measured elevation differences between successive benchmarks (Del Gaudio et al., 2011). Measurements were carried out in 1978, 1984, 1987, 1990, 1994, 1997, 2001, 2003, 2006, 2010 and 2017 (Database). The data have been analyzed and modelled by Trasatti et al., 2019. For the analysis the authors selected the more complete time series of 1987, 1990, 1994, 1997, 2001, 2003 and 2010. The last leveling of 2017 was carried out only along a small portion of the northern part of the network (Ricco et al., 2018) and does not permit a complete evaluation of the deformation field of the island. The complete dataset is presented in this database.