Hydration status is a significant component to keep the functions of body work system. Memory is one of the cognitive brain functions owned by human. It enables human to take daily activities optimally. The purpose of this study was to determine the correlation between hydration status and memory on nursing students. AThis research employed comparative analytical method with cross sectional approach. This research employed 152 students who were selected through a simple random sampling technique. The measurement of hydration status was obtained from calculating urine specific gravity using urinometer while Everyday Memory Questionnaire (EMQ) used to measure memory. This research employed independent T test to identify the relationship between hydration status and memory. The result of the research reveals that there is a significant difference between the value of average memory score on nursing students who do not suffer from dehydration and those who suffer from dehydration (p=0.003; t=3.040). Therefore, maintaining the balance of dehydration status is crucial to make the memory work optimally.