A marked knowledge gap exists concerning the information needs of hepato-pancreato-biliary (HPB) surgical oncology patients. We investigated the comprehensive information needs of this patient population, including the type and amount of information desired, as well as the preferred method of receiving information. A questionnaire was administered to patients being treated surgically for cancers of the liver, pancreas, gallbladder, or bile ducts at Toronto General Hospital, part of the University Health Network, in Toronto, Canada. The questionnaire examined patients' information needs across six domains of information: medical, practical, physical, emotional, social, and spiritual. Among 36 respondents, the importance of information and amount of information desired differed significantly by domain (both p < 0.001). This group of patients rated information in the medical and physical domains as most important, though they also desired specific items of information from the emotional, practical, and social domains. Patients' overwhelming preference was to receive information via a one-on-one consultation with a healthcare provider. It is important for healthcare providers working with HPB surgical oncology patients to be comprehensive when providing information related to patients' cancer diagnosis, prognosis, associated symptoms, and side effects of treatment. Certain emotional, practical, and social issues (e.g., fears of cancer recurrence, drug coverage options, relationship changes) should be addressed as well. Face-to-face interactions should be the primary mode of delivering information to patients. Our findings are being used to guide the training of healthcare providers and the development of educational resources specific to HPB surgical oncology patients.