The main objective of the study presented in this article was to examine the relationship between trait curiosity and two self-concept constructs which are gaining popularity in the creativity literature – creative self-efficacy (CSE) and creative personal identity (CPI). Although the role of curiosity in creativity seems well established, in fact there is little empirical evidence of the relationship between curiosity treated as a trait and both CSE and CPI. In a study conducted on a sample of middle and high school Polish students (N = 284; 55% female, aged 13–18, M = 14.74, SD = 1.14), curiosity was measured by the Curiosity and Exploration Inventory (CEI-II; Kashdan, Gallagher, Silvia, Winterstein, Breen, Terhar, & Steger, 2009) and CSE and CPI by the Short Scale of Creative Self (SSCS; Karwowski, Lebuda, & Wiśniewska, in press). Confirmatory factor analysis revealed the existence of substantial correlations between measured constructs. Latent factor of CSE correlated strongly with a tendency to seek out new experiences (stretching, r = .72) and an acceptance of unpredictability (embracing, r = .67), while CPI correlated substantially with stretching (r = .62) and slightly less with embracing (r = .48) – all correlations were highly reliable (p < .001). Hierarchical confirmatory factor analysis showed the existence of a strong relationship between the higher-order factor of curiosity (composed of stretching and embracing) and creative self (composed of CSE and CPI): r = .75, which may indicate common basis of creativity and curiosity. The consequences of curiosity for the development of CSE and CPI are discussed.