Health care chaplains participated in a multicenter trial to explore an implementation strategy for the Dutch multidisciplinary guideline for spiritual care. The intervention was concise spiritual care training for hospital staff of departments where patients in curative and palliative trajectories are treated. Data were collected in semistructured interviews with chaplains who acted as trainers, before and after the intervention. Results based on nine preintervention and eleven post-intervention interviews are presented. During preintervention interviews, chaplains describe the baseline situation of palliative care in Dutch hospitals, barriers, and opportunities for improving spiritual care. In the postintervention interviews, characteristics of the training, effects, and critical success factors were identified. Positive effects such as lowering barriers, increasing health care professionals' competences, and increasing health care chaplains' profile are possible. Chaplain-led, multidisciplinary spiritual care training is a feasible method to start implementation of spiritual care in hospitals, as described in the multidisciplinary guideline.