Purpose: The purpose of this study was to explore the relationship among suicidal ideation, parental attachment, and self-identity of college students. Methods: This study was designed as a descriptive correlational research. The participants were 314 college students in Gyeongbuk province. Data were collected from September 23 to Oct 5 in 2009 using a structured questionnaire. Data were analyzed by t-test, ANOVA, and Pearson correlation coefficient using SPSS WIN (Version 12.0). Results: Suicidal ideation showed negative correlations with maternal and paternal attachment (r=-.20, p<.001; r=-.24, p<.001, respectively) as well as self-identity (r=-.37, p<.001). Self-identity had positive correlations with maternal and attachment (r=.16, p=.006; r=.23, p<.001, respectively). Conclusion: The findings suggest that suicidal ideation may be decreased when college students have higher parental attachment and self-identity. Strategies to improve parental attachment and self-identity are needed in near future.