Background. To improve nutritional care for community-dwelling older adults before, during, and after hospitalization, factors influencing nurses’ current behavior should be targeted. The aim of this study was to obtain expert consensus on which factors influencing the behavior of hospital and home care nurses are most relevant, modifiable, and feasible to influence. Method. In a two-round Delphi study, nine pre-selected factors were rated by 26 experts. Results. Eight factors were rated as relevant, modifiable, and feasible to influence: (1) lack of sufficient knowledge, (2) mainly neutral attitude, (3) low prioritization, (4) ambiguous motivation to routinely use guidelines and screening tools, (5) moderate awareness about risk factors, (6) lack of sense of involving informal caregivers, (7) ambiguous motivation to follow education and training, and (8) strong focus on medical nutrition. Conclusion. The expert panel reached consensus on eight factors influencing nurses’ current behavior. To enhance nutritional care to prevent malnutrition in older adults, strategies are needed for targeting these factors in nursing practice, education, and research.