Thymol, a natural monoterpenoid phenol commonly found in thyme extract, possesses numerous therapeutic properties, including antioxidant, antimicrobial, and anti-inflammatory activities. This study aimed to develop a novel approach for cervical cancer treatment by evaluating the effects of a thymol-loaded nanoemulsion on the human cervical cancer cell line, HeLa. The research focused on three key biological markers: the expression of the pro-apoptotic gene BAX, the anti-apoptotic gene BCL2, which are indicative of the cell's antioxidant capacity. A stable thymol nanoemulsion was synthesized and characterized. Dynamic Light Scattering (DLS) analysis revealed a uniform particle size of 72.6 nm. The cytotoxic effects of the nanoemulsion on HeLa cells were assessed using an MTT assay, which determined the half-maximal inhibitory concentration (IC50) to be 111.96 µM. HeLa cells were then treated with this IC50 concentration to investigate the molecular mechanisms of action. Real-Time Quantitative PCR (RT-qPCR) analysis demonstrated that the thymol nanoemulsion significantly modulated the expression of key apoptotic genes. The expression of the pro-apoptotic BAX gene was upregulated by 1.7-fold, while the expression of the anti-apoptotic BCL2 gene was downregulated to 0.71-fold of the control level. This shift resulted in a significant increase in the BAX/BCL2 ratio, favoring apoptosis. Moreover, a colorimetric assay revealed that treatment with the thymol nanoemulsion caused a significant reduction in the total free thiol content in HeLa cells, from 751.66 µM in control cells to 531.66 µM in treated cells, indicating an induction of oxidative stress. In conclusion, the results of this study suggest that the thymol nanoemulsion effectively reduces the viability of cervical cancer cells by inducing apoptosis through a dual mechanism: (1) activating the intrinsic apoptotic pathway by altering the BAX/BCL2 balance and (2) disrupting the cellular redox homeostasis by depleting free thiol groups. These findings highlight the potential of thymol nanoemulsion as an effective therapeutic agent for cervical cancer.