Abstract
This study examined suicidal behaviour through smartphone addiction among undergraduate students in the University of Ibadan. A quantitative research methodology was used in the study, and 300 students from different university faculties were chosen at random. The primary tool used to gather data was a questionnaire, and PPMC and regression analysis were used to examine the results. It was established from the study that almost 94.3% of the respondents attested to the fact that they used smartphones frequently and that smartphone addiction significantly contributed to suicide behaviour among undergraduates. Also, a substantial positive link was related to smartphone addiction and suicide behaviour among the students, whereas female undergraduates were prone to greater suicidal behaviour (t = 0.629, df = 294; Issue 1/2025 510 p<0.05) than their male counterparts. The study concluded that undergraduates' addictions to smartphones could eventually lead to suicidal behaviour putting into consideration other factors among them. The study, therefore, recommended strengthening students' support services, such as counselling and other behavioural modification units, to help students struggling with smartphone addictions and mental health issues.