Self-objectification, the tendency to perceive oneself as an instrument rather than a fully human, has been linked to numerous adverse psychological outcomes (e.g., poor well-being and high aggression). Thus, investigating how to reduce self-objectification is of urgent importance. Across six studies (total N = 1401), with various designs (i.e., correlational, experimental, and diary studies) and samples (i.e., general population and employees), we consistently found that NC significantly reduced self-objectification. Study 1, with a correlational design, showed that participants' NC negatively predicted self-objectification. Studies 2a and 2b (pre-registered), with two manipulation paradigms (viewing the natural pictures and a bogus-feedback task), established a causal relationship between NC and reduced self-objectification. Study 3 identified the authentic self as a mediator in this relationship through measurement-of-mediation (Study 3a, pre-registered) and experimental-of-chain approaches (Study 3b). Finally, Study 4, using a daily diary approach, confirmed the dynamic relationship between daily experiences of NC and self-objectification, highlighting both short-term and long-term effects. The above effect of NC on self-objectification can be applied to the general population (Studies 1-3) and employees (Study 4). A single-paper meta-analysis, including Studies 2a-b and 3a, showed a medium effect size. These findings suggest that NC serves as a beneficial resource for reducing self-objectification, demonstrating its function in fostering a humanized self-concept and offering practical implications for improving psychological well-being.