The impact of public expenditure on economic growth is a topicthat has been of great interest to many researchers, e.g., [1],[10], [14], [23], [33]. However, the studies on this impact illustrate that the results are inconsistent. Besides, certain explanatory variables which should be included in the model were notspecied. This ambiguity aects the reliability of the results.Using Bayesian Model Averaging (BMA) method with the dataobtained from 43 Asian countries in the period 2004-2016, weestimate the impact of public expenditure on economic growthwith a large number of explanatory variables included in themodel. The research results show that public expenditure hasa negative impact on the economic growth in Asian countries.On the other hand, the components of public expenditure havea weak impact on economic growth. The empirical results confirm that since the majority of Asian countries are developingcountries with a large proportion of state-owned sectors andlow governance quality, large scale of public expenditure doesnot have positive eects on the economic growth. Based on theresearch results, this study provides policy implications to improve governance quality and eciency of public expendituresin Asian countries.