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Purpose: This study conducted a systematic literature review to analyze the factors related to suicidal ideation among firefighters. Methods: A systematic literature review was conducted to identify factors influencing suicidal ideation among firefighters, using Korean academic information search services from January to June 2022. A total of 238 articles were searched using keywords such as “firefighter,” “depression,” “post-traumatic stress disorder (PTSD),” “cognitive emotion regulation,” “suicide,” and “suicidal ideation.” Among them, nine articles were selected for analysis using descriptive correlation studies. Results: It was found that the relationship between firefighter stress (PTSD) and suicidal thoughts was mediated by depression. Even if the stress level (PTSD) was high, suicidal thoughts decreased when the emotional coping level was high. Conclusion: To prevent firefighters from committing suicide, intervention programs with effective approaches to quickly identify high at-risk people and improve their emotional coping skills, should be implemented.