The number of studies for the future improvement of the standard ISO 9001, which is the most used standard in many areas, is limited. Within this research scope, the number of ISO 9001 certificates registered between 1993 and 2019 in some G20 countries was evaluated, and the number of certificates for 2020-2026 was estimated using the Eviews 11 program. Time series regression and exponential smoothing methods are used in estimation calculation. According to the number of certificates estimated for 2026, country rankings were determined as India (43,947), Brazil (22,744), Canada (11,814), USA (37,235), Mexico (9,977), Argentina (8,433), Russian Federation (1,540), Australia (5,072), South Africa (4,626) and Saudi Arabia (2,785). Changes are expected in Canada, the Russian Federation, Australia and Mexico in 2026 when the 2019 certificate number of countries’ ranking is considered. A decrease in Australia and the Russian Federation’s certificate number was foreseen for 2026. It is thought that the research will contribute to the interpretation of ISO 9001 performance of nine countries and to how the future trend will be shaped.