Building on the strong work of previous research agendas (2009-2012, 2012-2015, 2015-2018), the Hospice and Palliative Nurses Association Research Advisory Council developed the 2019-2022 Research Agenda in consultation with Hospice and Palliative Nurses Association (HPNA) membership and assessment of major trends in palliative nursing. The HPNA Research Advisory Council identified 5 priority areas and asked subject experts in each area to summarize the state of the science, identify critical gaps, and provide recommendations for future research. This document expands the executive summary published on the HPNA website (www.advancingexpertcare.org/hpna/) and provides supporting evidence for the 2019-2022 recommendations. The 5 priority areas are as follows: (1) pediatric hospice and palliative nursing research; (2) family caregiving; (3) interprofessional education and collaborative practice; (4) big data science, precision health, and nursing informatics; and (5) implementation science.