Purpose: The aim of this study was to identify nutritional status of older adults receiving ostomy care and to determine risk factors related to malnutrition Methods: The participants were 122 older adults with an ostomy. Data collection was conducted using a structured questionnaire. Collected data were analyzed using descriptive statistics, x2 test, Fisher's exact test, and logistic regression with the SPSS 22.0 program. Results: Results from Mini Nutritional Assessment showed that for nutritional status, 45.9% of respondents had good nutritional status, 32.0% were at risk for malnutrition and 22.1% were considered malnourished. Factors related to nutritional status were occupation (p=.005), economic status (p<.001), stoma retention period (p=.002), and ostomy care provider (p=.005). The reason for ostomy surgery was the most important determinant of malnutrition (odds ratio 3.27; 95% CI, 1.13~9.49). An additional predictive patient factor was ostomy care provider (OR, 3.07; 95% CI, 1.08~8.76). Conclusion: These results indicate that risk factors related to malnutrition in older patients are the reason for the ostomy surgery and the ostomy care provider. Therefore, in developing nursing education programs for older adults with an ostomy consideration must be given to the characteristics and problems of malnutrition and nutrition interventions.