Purpose: The purpose of this study was to identify the factors influencing suicidal ideation in older adults with osteoarthritis. Methods: Data was collected by questionnaires using face-to-face interviews from 87 outpatients selected at a private hospital. The data was analyzed using SPSS/WIN 12.0. Results: The mean scores of disability, depression and suicidal ideation were 58.5, 18.1 and 8.3 respectively. There were significant differences in suicidal ideation according to socio-demographic factors such as education, present job, marital status, residence with, economic status, difference in caregiver. Depression was a significant predictor of suicidal ideation (F=51.15, p<.001). Conclusion: Based on the findings of this study, to prevent suicidal ideation for older adults with osteoarthritis, nursing intervention program should include psychological care for depression as well as physical care for disability reduction.