Background: Chaplain-led communication-board-guided spiritual care may reduce anxiety and stress during an intensive care unit (ICU) admission for nonvocal mechanically ventilated patients, but clinical pastoral education does not teach the assistive communication skills needed to provide communication-board-guided spiritual care. Objective: To evaluate a four-hour chaplain-led seminar to educate chaplains about ICU patients' psychoemotional distress, and train them in assistive communication skills for providing chaplain-led communication-board-guided spiritual care. Design: A survey immediately before and after the seminar, and one-year follow-up about use of communication-board-guided spiritual care. Subjects/Setting: Sixty-two chaplains from four U.S. medical centers. Measurements: Multiple-choice and 10-point integer scale questions about ICU patients' mental health and communication-board-guided spiritual care best practices. Results: Chaplain awareness of ICU sedation practices, signs of delirium, and depression, anxiety, and post-traumatic stress disorder in ICU survivors increased significantly (all p < 0.001). Knowledge about using tagged yes/no questions to communicate with nonvocal patients increased from 38% to 87%, p < 0.001. Self-reported skill and comfort in providing communication-board-guided spiritual care increased from a median (interquartile range) score of 4 (2-6) to 7 (5-8) and 6 (4-8) to 8 (6-9), respectively (both p < 0.001). One year later, 31% of chaplains reported providing communication-board-guided spiritual care in the ICU. Conclusions: A single chaplain-led seminar taught chaplains about ICU patients' psychoemotional distress, trained chaplains in assistive communication skills with nonvocal patients, and led to the use of communication-board-guided spiritual care in the ICU for up to one year later.