PURPOSE: This study was conducted to explore the influence of academic institutional interest, open parent-adolescent communication, social (friend) support, and existential spiritual well-being on suicidal ideation of college students. METHODS: The research design was descriptive survey research involving 285 college students in city G. Data was collected from May 18, 2011 to November 2, 2011 and analyzed using descriptive statistics, t-test, one-way ANOVA, Pearson correlation coefficient, and hierarchical regression analysis. RESULTS: The findings reveal that suicidal ideation of college students was low, i.e., average score was 9.2+/-3.65 (possible range 5~25). This study determined that suicidal ideation is negatively correlated with interest on the part of the academic institution, open parent-adolescent communication, social support from friends, and existential spiritual well-being. The extent of existential spiritual well-being was a significant predictor of suicidal ideation, controlling for general characteristics variables (gender, number of close friends, first supporter) and institutional interest, open parent-adolescent communication, and social support. Existential spiritual well-being accounted for 50% of the explanation of suicidal ideation of college students. CONCLUSION: Based on the outcomes of this study, designing an intervention program that emphasizes existential spiritual well-being in order to decrease suicidal ideation of tertiary education students is strongly recommended.