Investments in environmental protection in the Republic of Croatia from 2018 to 2022 represent a key element of the national strategy for sustainable development and ecological sustainability. During this five-year period, Republic of Croatia significantly increased investments in environmental protection projects, which is reflected in the growth of output, gross added value and employment in the sector. Output in environmental protection activities increased from EUR 1.753,9 million in 2018 to EUR 2.093,7 million in 2022, which indicates increased economic activity and production in this sector. Gross value added (GVA) also increased significantly, from EUR 741,1 million to EUR 890,4 million, reflecting higher economic productivity and added value created through environmental projects and technologies. The number of employees in the environmental protection sector shows stable growth, from 38.101 employees in 2018 to 44.147 in 2022. This increase in employment reflects the expansion of the sector, the creation of new jobs and the increased need for experts in various areas of environmental protection. Investments are focused on key sectors such as renewable energy sources, waste management, water and air protection, and conservation of natural resources. The increase in investment can also be attributed to greater access to European funds, technological innovation and growing needs to adapt to climate change. Although significant results have been achieved, the sector faces challenges such as harmonizing with international standards and ensuring long-term sustainability. For the future, it is crucial to continue investing in innovation, improve connection between public and private sectors, and strengthen mechanisms which are using to evaluating and monitoring the effectiveness of investments.