Introduction: Nurses are the first healthcare professionals who meet patients who attempt suicide, and their attitudes toward these patients may be important. The purpose of this study was to evaluate the effect of demographic factors on nurses' attitudes toward patients who attempt suicide and the quality of nursing care that these patients receive. Materials and Methods: This descriptive-correlational study was performed using the convenience sampling method on 182 nurses working at selected hospitals of medical universities in Tehran, Iran. Data were collected using questionnaires that gathered information about demographics, nurses' attitudes toward patients who attempted suicide, and the quality of nursing care provided. Data were analyzed by the Statistical Package for the Social Sciences v.20 software and by the Pearson test and t-tests.Results: Regarding social and mental aspects, we found no significant statistical relationship between age and work experience with respect to nurses' attitudes toward and the quality of care provided to patients who attempted suicide, but women provided higher-quality nursing care than men (P=0.046). Although the relationship between education and quality of nursing care was statistically significant (P=0.007), we found no significant relationship between education and attitude. Conclusion: We found no significant relationship between age and work experience with respect to nurses' attitudes toward, and the quality of care provided to, patients who attempted suicide, but women provided higher-quality nursing care than men. Furthermore, quality of care was higher from nurses who had a bachelor-level education, suggesting that higher-educated nurses should be recruited to care for critical patients.