The purpose of this thesis was to apply economic theories in order to have the opportunity to understand and form an idea of whether immigration has an impact on the economic growth of OECD countries. This study includes four different theories, the Solow model, Borja’smodel, modern institutional economics and Romers’ model where the study is based on these models combined with variables able to explain and perceive how immigration together with four other important variables has an impact on growth in these countries. The variables in addition to immigration and growth that this study decided to use are the level of education in the labor market, asylum-seeking migrants, public expenditure and labor market participation.The aim of this paper is to highlight the empirical connections between these factors as immigration is a controversial topic. This thesis question was therefore very topical and interesting and can thus be answered with the fact that immigration has a positive connection with the OECD countries’ economic growth.