FDI is perceived as a major source of financing for developing countries and also, to be a potential source of economic growth. The purpose of this thesis is to investigate the impact of foreign direct investment on economic growth in 15 post-Soviet countries. This by, firstly, examining the effect of the foreign direct investment on economic growth and secondly, by examining the effect of FDI on economic growth, while taking corruption into account. Also to be investigated is how much FDI affects economic growth as corruption changes. Panel data is used for the regression models and the period examined is between 1999 and 2016. The results of the empirical work indicate that foreign direct investment has a positive effect on economic growth in post-Soviet countries, both when considering FDI by itself and when examining the interaction term between FDI and CPI. It is further found that corruption is perceived to have a positive effect on economic growth as it is “greasing the wheels” rather than “putting sand in them”.