International audienceMeasurements of KS0 meson production via its π+π− decay mode in inelastic p+p interactions at incident projectile momenta of 31, 40 and 80 GeV/c (sNN=7.7,8.8 and 12.3 GeV, respectively) are presented. The data were recorded by the NA61/SHINE spectrometer at the CERN Super Proton Synchrotron. Double-differential distributions were obtained in transverse momentum and rapidity. The mean multiplicities of KS0 mesons were determined to be (5.95±0.19(stat)±0.22(sys))×10−2 at 31 GeV/c, (7.61±0.13(stat)±0.31(sys))×10−2 at 40 GeV/c and (11.58±0.12(stat)±0.37(sys))×10−2 at 80 GeV/c. The results on KS0 production are compared with model calculations (Epos1.99, SMASH 2.0 and PHSD) as well as with published data from other experiments