Introduction: Complex wound is a wound that does not heal in four to eight weeks. In addition to other healing factors, nutrition of a patient significantly influences the wound healing process. According to many studies, patients’ nutritional status is often worse than normally and patients are often malnourished. Nutritional risk assessment and screening as well as nutritional recovery steps are essential when treating patients with complex wounds. Purpose: By using a nutritional risk assessment tool MNA – Mini Nutritional Assessment, we aim to explore the nutritional risks of patients with complex wound. Methods: We conducted a retrospective study involving 100 patients with a complex wound treatment and acquired the data using a nutritional history, a nutritional risk assessment tool – Mini Nutritional Assessment – and anthropometric measurements. Results: The average age of subjects in the study is 68.74 years, 75% are older than 60 years. The study shows that the body mass index (BMI) of 20% of subjects is lower than 23 while BMI of 80% is higher than 23. The results also show that 30 patients out of 100 have lost more than 3 kg body weight in recent months, and 24 have lost 1 kg to 3 kg. According to the study, 10% of the patients are malnourished, 39% of them are subject to possible risk of malnutrition while the remaining 51% do not show dietary threats. Discussion and conclusion: Apart from a number of studies that emphasize the importance of nutrition and draw attention to the malnutrition of patients with wounds, many patients are still undernourished. Effective steps to avoid the problem would be the introduction of routine dietary testing and integrating nutritionists into a professional team for complex wound care. An important contribution to an increased level of self-care and a better life quality of these patients would also be an effective health education, closely connected with primary level of health care.