Context: To provide high-quality palliative care to nursing home residents, staff need to understand the basic principles of palliative care. Objectives: To evaluate the extent of agreement with the basic principles of palliative care of nurses and care assistants working in nursing homes in five European countries and to identify correlates. Methods: This is a cross-sectional study in 214 homes in Belgium, England, Italy, the Netherlands, and Poland. Agreement with basic principles of palliative care was measured with the Rotterdam MOVE2PC. We calculated percentages and odds ratios of agreement and an overall score between 0 (no agreement) and 5 (total agreement). Results: Most staff in all countries agreed that palliative care involves more than pain treatment (58% Poland to 82% Belgium) and includes spiritual care (62% Italy to 76% Belgium) and care for family or relatives (56% Italy to 92% Belgium). Between 51% (the Netherlands) and 64% (Belgium) correctly disagreed that palliative care should start in the last week of life and 24% (Belgium) to 53% (Poland) agreed that palliative care and intensive life-prolonging treatment can be combined. The overall agreement score ranged between 1.82 (Italy) and 3.36 (England). Older staff (0.26; 95% confidence interval [CI]: 0.09–0.43, P = 0.003), nurses (0.59; 95% CI: 0.43–0.75, P < 0.001), and staff who had undertaken palliative care training scored higher (0.21; 95% CI: 0.08–0.34, P = 0.002). Conclusions: The level of agreement of nursing home staff with basic principles of palliative care was only moderate and differed between countries. Efforts to improve the understanding of basic palliative care are needed.