BackgroundCancer has been associated with an increased risk of suicidal behaviors and suicide has been one of the leading causes of non-cancer-related mortality among cancer patients in recent years. However, there is limited evidence on suicidal behaviors in patients diagnosed with cancer at Jimma University Medical Center.ObjectiveThis study aimed to assess the magnitude and associated factors of suicidal ideation and attempts among cancer patients at Jimma University Medical Center, Ethiopia, in 2023.MethodsA hospital-based cross-sectional study was conducted among 271 cancer patients at Jimma University Medical Center from 1 to 30 November 2023. Data were collected using interviewer-administered questionnaires and a consecutive sampling technique was employed. Suicidal ideation and attempts were assessed by the Composite International Diagnostic Interview Module. Logistic regression analysis was used to evaluate the significance of the association between the dependent and independent variables. Variables with a p-value