Provided are a hydrogel composition with high viscoelasticity and a bioink composition including the hydrogel composition. The hydrogel composition according to an embodiment is composed of natural biocompatible substances and thus is not toxic, but has high viscosity, resulting in high mechanical stability or long persistence. Thus, the hydrogel composition may be usefully utilized as a bioink composition for bioprinting, a support in tissue engineering, or a soft tissue filler.