Ancient secular variation in Central Mexico was determined from paleomagnetic measurements on 45 independent lava flows ranging in age (14C and K-Ar dates) from 2,500 to 580,000 years B.P. All the analyzed flows are characterized by a normal polarity placing them within the Brunhes Chron. The paleosecular variation analysis yielded an angular standard deviation from the field of an axial dipole of 15.3¿ with 95% confidence limits of 13.4¿ and 17.9¿, and that of the corresponding Virtual Geomagnetic Poles (VGPs) of 13.9¿ with confidence limits of 12.1¿ and 16.1¿. These values are in agreement with those predicted by most statistical models of secular variation, but divergent from those obtained from low latitudes (19¿N) such as Hawaii and Pagan Is.