Economic theory maintains that public investment has to be well directed so that it has a positive impact on the economy, otherwise it slows down product growth and the much-required multiplier is not activated. The objective of this thesis is to determine the influence of public investment on the economic activity of the department of Loreto, during the period 2018 - 2022. This research is Quantitative, Correlational level and Non-Experimental in design. It concludes that public investment does not influence the economic activity of Loreto, during the period 2018 – 2022, validating with the Correlation Coefficient which was r = 0.364510308; and with the Coefficient of Determination it was R2 = 0.132867764; both values that do not reach the required minimums. The level of government that executed the largest amount of public investment was the Regional Government, executing 40.68% of t...