The growth of e-commerce, the expansion of logistics networks, and increasingly stringent environmental regulations aimed at limiting the use of plastic packaging have driven increased demand for corrugated paperboard packaging and, consequently, recycled packaging papers, particularly testliner and fluting. Given the considerable dependence of the Iranian and regional markets on packaging products and the limited availability of comprehensive studies on the economic feasibility of recycled paper production units, this study aimed to conduct a techno-economic assessment of establishing a recycled packaging paper plant with a nominal capacity of 60,000 tons per year. The study is applied and developmental in nature and employs a descriptive-analytical approach. The required data, including fixed and working capital investment, raw materials, chemicals, energy, labor, and product selling prices, were collected from equipment quotations, the domestic recycled-materials market, and industrial standards. Project economic indicators were calculated using accounting methods and discounted cash-flow analysis over a 23-year horizon, comprising three years of construction and 20 years of operation. The sensitivity of the results to changes in waste-paper prices, exchange rates, and product selling prices was also examined. The results indicated that the total required investment was IRR 5,105.65 billion. The net present values from the project and shareholders’ perspectives were IRR 4,211.25 billion and IRR 6,266.45 billion, respectively, while the corresponding internal rates of return were 31.5% and 42.9%. The project incurred net losses during the first three years of operation and became profitable from the fourth year onward. Product selling price and waste-paper purchase price were identified as the most sensitive variables affecting profitability. Overall, the project demonstrates long-term economic feasibility, provided that nominal growth in product selling prices continues and liquidity is effectively managed during the initial years of operation