Obesity poses a serious risk to health; however, data on obesity trends in the Russian Federation are scarce. Objective — to analyze the primary and overall incidence of obesity in different age groups by visits to the therapeutic and prophylactic institutions of the Russian Federation (RF) in 1992 to 2012. Material and methods. The data registered in the RF on obese patients (Statistical Reporting Form No12 «Report on the number of diseases notified in patients living in the area served by a healthcare facility») were analyzed, by taking into account the data of the Russian State Statistics Service on the average annual population size in the respective region and the corresponding age in 1992—2012. Regional data on 73 RF subjects were assessed by the 2010—2012 reports; and those on 8 Federal Districts were by the 2012 reports. Results. In 1992 to 2012, overall obesity rates were observed to increase by 190% in children, by 283% in teenagers, and by 324% in adults. In 1992 to 2002, the overall obesity rates increased by 106% in children, by 41% in adolescents, and by 82% in adults; and in 2002 to 2012, these rose by 60, 171 and 133% respectively. The abrupt rise in the overall obesity rates occurred in children in 2002, in adolescents in 2002 and 2006, and in the adult population in 2006. In 2012, the primary incidence of obesity in adolescents was 4.54 and 1.54 times higher than in adults and children, respectively; and the overall incidence was 2.86 and 2.54 times higher than in adults and children. There are regional variations in the accounted incidence of obesity. In the regions, the high incidence in children is not always associated with that in the adult population. Conclusion. In 1992 to 2012, overall and primary obesity rates increased in all age groups in the RF, this trend has been most pronounced among adolescents since 2002. The increase in medical visits for obesity in all age groups, underdetection of diseases predominantly in adults, and regional differences in the accounted incidence rates suggest that the prediction of obesity rates in the RF is unfavorable.