The topic of the study was chosen based on the importance of investment in general and private investment in particular, and the research started from the hypothesis that there are some macroeconomic variables that have a significant impact on private investment in Iraq, which caused a decrease in the role of the private sector in the economy, For the purpose of proving the hypothesis, the research was divided into two topics, as the first section dealt with the theoretical framework of private investment and its relationship to some economic variables such as inflation, unemployment and gross domestic product, while the second study dealt with the standard aspect to explain the effect of these variables on private investment, and the research reached several conclusions, the most important of which is the proof of the significance of the regression coefficient For the independent variables on private investment through (t) test, as (t) calculated is greater than the tabular for all variables, and the (F) test indicates the statistical significance in the model that the value of (F) calculated is greater than the tabular. As for the recommendations, the most important one is to give the private sector more support, attention and care by expediting the adoption and implementation of legislation and laws that increase the participation of this sector in the economy and make investments.