Background: The ACGME requires incorporating palliative care (PC) competencies into Hematology and Medical Oncology (HMO) fellowship curriculum. The primary aim of this study was to determine the attitudes and beliefs regarding PC of HMO fellows who completed a 4 week mandatory PC rotation. Methods: The rotation included a 4 week standardized curriculum covering all PC domains and all HMO fellows rotated in acute palliative care unit (APCU), consult service and outpatient clinic. HMO fellows were provided educational materials and attended all didactic sessions. All HMO fellows from 2004 to 2017 were sent a 39 item survey adapted from published studies on oncology trainee perception of PC. Results: 77/105 (73%) HMO fellows completed the survey (median age of 40 years, 57% males and 82% practicing in an academic setting). The following were reported to improve after the PC rotation: (a) assessment and management of symptoms (98%); (b) opioid prescription (89%), opioid rotation (78%) and identification of opioid side effects (87%); (c) communication with patients and families (91%), advance care planning discussion (88%), DNR discussion (88%); (d) comfort discussing ethical issues (74%); (e) ability to cope with stress of terminal illness (58%). Strongly agree to agree was expressed by 76 (98%) for improved knowledge of symptom assessment & management vs 57 (74%) for ethics (p = 0.0001) and 45 (58%) for coping with stress of terminal illness (p = 0.0001). HMO fellows were more likely to refer patients to PC (83%) for uncontrolled symptoms (97%), psychological distress (88%) or with advanced disease regardless of symptoms (56%) after the rotation. The APCU rotation was felt to be most beneficial (93%). The PC rotation educational experience was felt to be either far better or better (53%) or same (45%) as other oncology rotations. 98% would recommend PC rotations to other HMO fellows and 95% felt rotation should be mandatory. Conclusions: HMO fellows reported PC rotation improved their knowledge in all PC domains, felt PC rotation was far better to better than other oncology rotations, and were more likely to refer patients to PC.