BackgroundGiven that the majority of suicide decedents visit primary care in the year preceding death, primary care has been identified as a key setting in which to engage patients at risk for suicide in mental health services. The objective of this research was to identify barriers and facilitators to engagement in mental health services among primary care patients at risk for suicide to inform the development of strategies to increase engagement.MethodsSeventy-four semi-structured qualitative interviews were conducted with primary care patients (n = 20), primary care (n = 18) and behavioral health (n = 12) clinicians, mental health intake coordinators (n = 4), and health system and clinic leaders (n = 20). Patients who had been referred for mental health services from primary care and reported an elevated score (≥ 1) on item 9 on the Patient Health Questionnaire at the time of referral were eligible to participate. Eligible clinicians and leaders were employed in a primary care or behavioral health setting in a single large health system with an integrated mental health program. Interviews typically lasted 30–60 min, were completed over video conference or phone, and were coded by members of the research team using a rapid qualitative analysis procedure.ResultsParticipants were primarily female (64.9%), white (70.3%) and non-Hispanic/Latine (91.9%). The most identified barriers to mental health care engagement were waitlists, capacity limits, insurance, patient characteristics, communication, collaboration, and/or difficulties surrounding travel. The most commonly cited facilitators of engagement included telehealth, integrated care models, reminders, case management support, psychoeducation, motivational enhancement, and scheduling flexibility. Concrete suggestions for improving engagement in mental health services included increasing communication between providers, streamlining referral and intake processes, providing reminders and follow ups, and advocacy for increased reimbursement for suicide risk assessment.ConclusionsResults underscore the myriad barriers patients at risk for suicide encounter when attempting to engage in mental health care in a primary care setting. Facilitators of engagement and suggestions for improving connections to care were also identified, which can inform the design of implementation strategies to improve engagement in mental health services among primary care patients at risk for suicide.Trial registrationClinicalTrials.gov Identifier: NCT05021224 (Registered August 19, 2021).