The research assumes that there is a direct relationship between agricultural investment and the value of agricultural output. Although the agricultural sector in Iraq has many elements that encourage investment in this sector, it suffers from the low value of agricultural output. The aim of this research is to measure the efficiency of agricultural investment in Iraq. Estimating and interpreting the relationship between agricultural investment and agricultural output in Iraq. The results of analyzes related to the criteria for the efficiency of agricultural investment in Iraq for the period (1990-2020). study examined the criteria of efficiency of agricultural investment in Iraq during the period (1990-2020). The criteria studied included: return on investment, investment rate, investment multiplier, capital deepening coefficient, and localization coefficient. The relationship between the value of agricultural production in Iraq and the studied agricultural investment efficiency criteria was also estimated. The average of total period studied (1990-2020) for the investment rate reached (19.6), which means that there is no efficiency in agricultural investment. As for the estimated average of return on investment, it was (26.15), indicating the efficiency in Iraqi agricultural investment. While the investment multiplier recorded an average of (0.723), achieving efficiency in relation to this criterion. The average of capital deepening coefficient was (76.73), showing that the sector is an intensive activity for employing the capital. While the localization coefficient of loans of the Agricultural Cooperative Bank in Iraq reached an average of (7944.73). This indicates that there is no efficiency in agricultural investment in terms of financing allocated to the Agricultural Cooperative Bank, thus avoiding real agricultural economic development and waste of material resources. To estimate the relationship between the value of agricultural production in Iraq and the aforementioned agricultural investment efficiency criteria during the period (1990-2020), multiple linear regression analysis was used based on the least squares method (OLS), taking into account that the independent variable (the value of agricultural production Y) is affected by a set of independent variables, namely the aforementioned investment efficiency criteria. Through the outputs of the applied regression model (Table 2), it is found that there was no statistically significant effect of return on investment, investment multiplier, and the localization coefficient on the value of Iraqi agricultural production. While the regression line equation shows that both the investment rate and the capital deepening coefficient proved their statistical significance at the level of significance (0.1%) in terms of their effect on the value of Iraqi agricultural production. In addition, the investment rate and capital deepening coefficient statistically explained about (38%) of the variation in the dependent variable (adjusted coefficient of determination = 0.377). This explanatory power is rather low, as the rest percentage (62%) was due to other variables not studied.