We examined how flexible cognitive control (FCC), one of the executive types of attention, affects creativity in adolescents. Two hundred adolescents performed an Attention Network Task (ANT), and then 60 participants were selected based on their scores in FCC function. Specifically, 30 adolescents who had scored thetop 15% FCC scores were included in the higher group, while another 30 adolescents who had scored the lowest 15% of FCC scores were sorted in the lower group. The creativity scores of the two groups of participants were examined using the Torrance Test of Creative Thinking (TTCT). The results of a multivariate analysis revealed that the participants in the “higher” group performed significantly higher than those in the “lower” group in all areas of creativity. Next, we conducted a series of multiple regression analyses to investigate whether alerting and/or orienting networks also affected the function of creativity. The results revealed that the alerting network explained significant variance only in the fluency scores of TTCT. Overall, using ANT and TTCT, we demonstrate a novel finding that FCC plays a crucial role in all areas of creativity in adolescents, the period in which the executive network develops dramatically. Further, we report the possible role of the alerting network in the function of fluency measured by TTCT.