Objective: To correlate cefalometry measures with the index of hypopnea/apnea (IAH) to evaluate the correlation of these measures with the gravity of the syndrome of the obstructive apnea-hypopnea of sleep (SAHOS). Material and Method: Retrospective study of the cefalometry of 101 carrying patients of SAHOS, referring to the period of 2003 to 2010. The examined measures had been: angle formed for the base of the skull with the jaw (SNA), angle formed for the base of the skull with the jaw (SNB), difference between SNA and SNB (ANB), distance between the mandible plan and the hyoid bone (MP-H), posterior airspace (SHOVELS) and distance between the posterior nasal spine and the tip of the uvula (PNS-P). Test ANOVA Krunkas-Wallis was carried through, to observe if it had difference between the cefalometric measures and the gravity of IAH, considering significant p < 0,05. Results: The majority of the patients presented cefalometry alterations, being that measures PNS-P and MP-H were modified in 91,1% and 85,1% of the patients, respectively. Relating with the IAH, measure PNS-P it presented a significant difference, with the patients with superior serious riots to the patients with moderate and light riots. Conclusion: The only cefalometry measure that presented significant alteration with the gravity of the SAOS was PNS-P.