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Purpose: This study aimed to investigate the relationship between forward head posture and pulmonary function in young women. Methods: Thirty-three young women participated in this study. The participants were grouped into non-forward head posture, mild forward head posture, and moderate-severe forward head posture groups. The craniovertebral angle (CVA) and pulmonary function were measured using ImageJ and a spirometer, respectively. Results: Statistically significant differences in the participants’ forced expiratory volume for one second (FEV1) and predicted forced expiratory volume for one second (predicted FEV1) were found among the three groups. No statistically significant differences in the participants’ forced vital capacity (FVC), predicted forced vital capacity (predicted FVC), FEV1/FVC, and peak expiratory flow (PEF) were found among the three groups. Furthermore, a significant positive correlation was found between CVA and FVC and among the predicted FVC, FEV1, and predicted FEV1. Conclusions: The results of this study demonstrate that severe forward head posture has a negative effect on pulmonary function in young women.