Few studies have explored the inter-relationships of sources of social support and caregiving self-efficacy with caregiver burden and patient's quality of life among patients with palliative care needs and their caregivers. This study tested the associations of two sources of social support (family and friends) and the mediating role of caregiving self-efficacy on caregiver burden and patient's quality of life. A convenience sample of 225 patient-caregiver dyads recruited between September 2016 and May 2017 from three hospitals in Hong Kong was included in the current analysis.