Postural changes of the head and neck can influence the process of voice production. The literature is scarce with regard to how the voice signal behaves in forward head posture, a postural change frequently. Assessing the influence of forward head posture in vocal production. METHODOLOGY: It have participated 30 men, between 19 and 30 years old, nonsmokers and without vocal complaints. Individuals issued the vowel / a / in two postures of head and neck: A) erect and B) forward head. The voices were recorded in Sound Forge and acoustic analysis performed by Kay Pentax MDVP. The acoustic variables studied were: fundamental frequency (F0), jitter, shimmer and harmonic noise ratio. The postures were photographed simultaneously with the issue of voice and analyzed by computerized photogrammetric in Corel Draw X3, getting the value for the condyle-acromion angle (ACA), formed by joining of the mandible condyle and acromion of the scapula with the line perpendicular to the ground. Statistical analysis was performed by the Shapiro Wilk test, Student t and Wilcoxon. RESULTS: The Sound of voices found a higher value of F0 (Hz) in position B, which was statistically significant (p <0.05). Photogrammetry indicated statistically significant difference in comparison of the angle between the ACA analyzed positions, indicating that participants were placed in position B with the head significantly forward in relation to its upright position. CONCLUSION: in the forward head posture is concluded that the voice becomes more acute.