Suicide poses a significant global public health concern due to its association with not only self-destructive behavior but the loss of life. The objective of this study was to examine factors associated with suicidal ideation among university students in Karen, Nairobi County, Kenya. The study adopted the phenomenological research design, to explore the lived experiences and perceptions of university students regarding the phenomenon under investigation. Participants were selected using purposive sampling technique. A total of 10 participants were recruited from five universities in Karen, with two participants selected from each institution. Data were collected using a semi-structured interview guide. With participants' informed consent and in strict adherence to the ethical principles of confidentiality and anonymity, all interviews were audio-recorded. Data were analyzed using thematic content analysis, and findings were presented in narrative forms. The findings of the study indicate that high academic expectations and heartbreak resulting from romantic relationship were the primary factors associated with suicidal ideation among university students in Karen, Nairobi County, Kenya. The study recommends that university institutions should establish peer mentoring and support groups to encourage open discussions about mental health and provide emotional support students.