Tourism industry has been an important contributor to the Malaysia, Indonesia and Thailand economy. The authors use the growth of real GDP per capita as a measure of economic growth and disaggregate it into economic growth created by tourism and economic growth created by other industries. This paper presents a methodology for measuring the contribution of tourism to an economy’s growth, which is tested with data for Malaysia, Indonesia and Thailand. A Growth Decomposition Method is used for measuring the contribution of tourism to an economy’s growth for Malaysia, Indonesia and Thailand from period 2000-2006