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Objectives?Many studies have examined how children with cerebral palsy (CP) manage to walk, but few have investigated running, yielding controversial results. The aim of this study was to quantitatively assess gait ability and its stability in children with hemiplegic CP while running and walking. Methods?A group of 20 children with spastic hemiplegia due to CP (CPG, 5.1???2.3 years old), and a group of 20 children with typical development (TDG, 5.9???2.6 years old) underwent a 10-m walking/running test with a wearable triaxial accelerometer fixed to their lower trunk. Spatiotemporal gait parameters, root mean squares of upper body acceleration, and related harmonic and symmetry ratios were computed. Results?Differences in gait speed were significantly higher during running ( ? 19% for CPG with respect of TDG) than during walking ( ? 14%, p?=?0.028). Conversely, no significant changes were observed in terms of gait stability, and the differences in terms of gait harmony along anteroposterior axis recorded during walking ( ? 43%, p?