Abstract: Background and Objective: The prevalence of malnutrition among hospitalized patients is quite high; therefore, the risk formal nutrition needs to be identified early. The objectives of this study were to determine the prevalence of malnutrition and to investigate the relationship between nutritional screening tools and nutritional status parameters. Materials and Methods: This study is an observational study with a cross-sectional design conducted in Waluyo Jati Regional Hospital Probolinggo, Indonesia. The subjects were 211 adult patients who were screened by the nutrition risk screening (NRS) 2002, simple nutrition screening tool (SNST)and malnutrition screening tool (MST) within 24 h of admission. Simple assessment tools, including body mass index (BMI), mid-upper arm circumference (MUAC), total body fat percentage of skeletal muscle, hemoglobin levels and TLC, were used to evaluate nutritional status. Differences in the mean nutritional assessment values between individuals at-risk and not at-risk of malnutrition were analyzed by t-tests. The relationships between the nutritional screening and nutritional assessment values were analyzed using chi-squared tests. Results: The results showed that 54.5% of the patients were at risk of malnutrition based on the NRS 2002 and SNST risk scores, while the MST showed that half of these patients were at risk (29.9%). A total of 47.4, 49.8, 70,6 and 62.6% of the patients were malnourished based on the BMI, MUAC, hemoglobin and TLC measures, respectively. The patients who were at risk of malnutrition had a lower average value of these nutritional parameters than did those not at risk. There were significant associations between all nutrition screening tools and all the nutritional status parameters (p<0,05), except for the TLC. Conclusion: The risk of malnutrition among hospitalized patients was high. The NRS 2002, SNST and MST have a strong correlation with the nutritional screening tools, indicating that lower nutrition screening values correspond to lower nutritional assessment values.